The Computer Turns On But The Monitor Does Not Show
The computer turns on but does not display an image on the monitor.
The most common malfunction is when the PC actually turns on, but does not display an image on the monitor. You can see the lights on the computer case and hear the fans running inside, but nothing happens on the screen. There are several possible reasons why your monitor is NOT displaying information on the screen and it is important that troubleshooting is streamlined.
1. Check your monitor. Before proceeding with more complex and time-consuming troubleshooting steps, make sure your monitor is working properly.
2. Verify that your PC fully completes the power on and off cycle. In other words, make sure your computer completes restart and shutdown completely.
Often the computer seems “not working””, when in fact he just has problems getting out of sleep or sleep mode.
3. Diagnose the cause by the beep code. The beep code will make it possible to quite accurately find the reason for the shutdown of the computer.
4. Clear CMOS. Clearing the BIOS on the motherboard will return it to its default settings. Incorrect BIOS setup can lead to display problems on the monitor screen.
5. Make sure the supply voltage switch is in the correct position. If the input voltage for the power is NOT correct (depending on the country), your computer may NOT turn on completely.
6. reinstall everything inside your PC. Reinstallation will restore various connections inside your computer and very often fix the problem.
Try reinstalling the following:
- Reinstall all internal and power cables
- Reinstall memory modules
- Reinstall used cards
7.Reinstall the processor if you suspect it was not installed properly.
8.Check for a short circuit inside the computer. This is often a prerequisite for a complete NOT turning on the computer, but it can also prevent the computer from booting completely or not displaying data on the monitor.
9. Check the power supply. The fact that the fans and lights on your computer are working does not mean that the power supply is functioning properly. PSU tends to cause more problems than any other hardware and is often a prerequisite for not fully booting the computer.
If your PSU fails the test, replace it.
The following steps are similar to steps 8 through 12 described in the article The computer turns on and then turns off.
The computer does not turn on, but the system unit fans are running
Resetting BIOS settings to factory settings
This is the easiest and, at times, very effective way to fix problems with computer boot. If your case is NOT the most difficult, perhaps it will help.
- Turn off the power to the computer and remove the cover of the system unit.
- locate the coin-cell battery on the motherboard and remove it from the slot.
- the contacts of the battery socket are closed together, for example, with a screwdriver;
- put the battery back.
There is another option for resetting the BIOS. with the Clear CMOS jumper (jumper). It must be removed for 15. 20 seconds. and move to two adjacent contacts, and then return to its place. Sometimes the jumper is called differently: CL_CMOS, CCMOS, CLRTC, CRTC, etc.
After completing these operations, connect the power to the computer and try to turn it on. If the problem is resolved, its cause lay in Incorrect BIOS Setup.
We replace components with a known good one
None of the ways helped? The last thing you can do at home is to take turns replacing the PC devices with work ones, of course, compatible with your system. However, there is a risk of damaging them.
If there is such an opportunity or desire, comments, as well as when the described problem occurs on a laptop. the only remaining option is to contact the service center.
What can a user do when he finds himself in such a situation? Even without having special equipment, you can try to solve the problem at home. It is enough to know how to use a screwdriver.
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According to statistics, most often the source of such a problem is the following:
- Damage to the BIOS. a program stored in a CMOS flash memory chip on the motherboard, which is responsible for the initial boot of the PC, as well as for checking and coordinating the operation of all its devices at the start-up stage;
- a failed processor or a malfunction of its power system;
- inoperability of RAM (random access memory) or incompatibility of installed RAM strips with each other;
- malfunction of the system logic chips (chipset) on the motherboard, especially the north bridge.
Of the second reasons, which can also give a similar “clinic”, it is possible to note the damage to the elements of the motherboard, leading to destabilization of the power supply of the devices, the defect of the soldered contacts of the microcircuits, the power supply unit with a “drop” in voltage along the separate lines, a dead CMOS battery, as well as malfunctions of other equipment installed on the PC. However, this is less common.
It is also important to understand that this issue is never the result of software glitches in the operating system. Since its download doesn’t even start.
lack of initialization
Failure to understand the nature of certain computer problems often leads to errors in diagnostics, without which a qualified repair is impossible. And you should approach the search for a problem with its precise description. A malfunction that is described with the words: “when you press the power button (power), the computer does not turn on, but the fans are running” is called a lack or an initialization error. It should not be confused with “not turning on”. complete inaction on pressing power, since the causes of THESE two problems are usually different.
Initialization, in this case, is the readiness of the equipment for operation. And if any of the devices that are critical for starting a PC refuses to start, we will observe a characteristic picture:
- after turning on the system unit, a loud noise of the fans is heard (they rotate at a constant high speed)
- the keypad and power indicators are on and ON;
- the screen remains black.
Nothing else happens.
Disable all unnecessary
If the first method did NOT help, move on. Let’s try to eliminate the influence of hardware, not necessarily for a successful start of the PC. To do this, you need to prepare a table covered with insulating material (polyethylene, rubber, plastic, wood, etc.), on which you will assemble the stand.
- Power off the PC and remove the case cover;
- remove the expansion cards from the slots of the motherboard, disconnect the power wires and interface cables from it, remove the memory brackets;
- Remove the motherboard from the case, put it on the table and inspect for artifacts. swollen capacitors, traces of overheating (darkening and deformation of plastic parts), mechanical damage and other defects;
- if there are artifacts, install one memory bar in the slot, Connect the card (if there is no built-in one), monitor, previously removed bootable hard drive and power supply;
- plug the power supply into the mains;
- prohibiting a screwdriver with the contacts of the power button. Power Switch (can be signed as ON, PWR_ON, PC_ON). this action is similar to turning on the computer by pressing this button.
If you see the operating system loading on the monitor, then the failure is caused by one of the disabled devices. Well, if apart from the rotation of the fans nothing happens again, let’s try to figure it out in more detail.
- Start the system. Carefully touch your hands to the processor heatsink and large board assemblies. microcircuits, mosfets, etc. they should normally be warm. Strong heating (do not burn yourself!). indicates a malfunction of the elements (soldering defect, short circuit), and a complete lack of heating (room temperature). most likely indicates that the node is NOT receiving a supply voltage.
- Power off the PC. Remove the memory stick, remove the oxide layer on its contacts by rubbing with a school eraser, blow through the slot where it was, and reinstall it. Turn on your computer. If the problem is resolved, the reason was poor contact between the RAM and the board connector. If you do not dare. set the bar to another slot. perhaps he is to blame.
19 Comments “The computer does not turn on, but the system unit fans are running
What could be the reason that the initialization error happens too often (sometimes once or even 2 a day). It can happen after turning off a normally working computer, and maybe even during operation (the monitor goes out, the fans are running). After resetting BIOC, everything works again.
Battery. M everything connected with her.
When you press the start button of the PC, you can hear how the computer is earning, but
the boot menu does not turn on. But if, for a while, click on
restart button (in the system unit itself). turns on Loading
What could be the problem and how to solve?
good, but if the problem is in the BIOS, reflash the BIOS?
If the BIOS is the problem, it should be flashed with the factory firmware. At the same time, make a dump of the previous firmware for verification.
Thank you. The information was helpful and everything worked out.
Hello! A friend brought him to check his IP on my system unit, after which the system unit stopped starting. The fan is spinning, both LEDs in front are on, it jerks hard when turned on (buzzing is heard). Neither reset nor cart does NOT help. On-off only with the switch at the back. What could be?
Good afternoon! I have such a problem: the computer turns on, but nothing is shown on the screen. I had such a problem after I installed additional RAM (only 2 slots), additional 512MB RAM, the same as it was built into 1 slot. I inserted an additional operating system, turned on the PC, and walked away literally for a couple of minutes, I went up. and there was an unpleasant smell from the system unit, immediately turned off the PC, disconnected the power supply from the network. I opened the lid, there is no visual damage, an unpleasant smell comes from the inside of the drive. I pulled out an additional operative, turned it on again and this problem began. The native operational was also inserted into the 2nd slot, but everything is the same. The new operative was also inserted into 2 slots. Testil. but nothing happened. The system manager starts working, but the screen does not show anything. What could be the problem and how can I fix it?
I tried the way the memory chip turned out.
Remove and reinsert the RAM. If it does not help, look towards the power supply. Ideally, replace it with a known worker. Also can West power button
If anything, “.and NOT what reaction.” spelled as “and no reaction” that is, together and through “S”
And then the eye_ cuts, as if it got to the site of the second grader O_o_o_
Step 3. check the monitor and monitor cable
Another important prerequisite for a black monitor when you turn on the system unit is a faulty monitor or a cable that goes in it from the system unit. In this case, the fans will also work, but of course no reaction will occur on the monitor.
Disconnecting the monitor cable from the system unit
Therefore, in order to check the monitor, it is not at all necessary to take another one, obviously a worker, for replacement. You just need to pull out the cable that goes from the monitor to the system unit from the card slot. In this case, at least some inscription should appear on the monitor stating that the cable is disconnected and the monitor goes into standby mode.
Work monitor message when cable is disconnected
If there is such a message on the monitor, then it is working. It remains to check the cable, but the likelihood that it has broken is small. Therefore, if you have where to take another cable from the monitor to the system unit to check, then it is worth checking it. If there is nowhere to take the cable, then go to the next point.
If there is an image, then try unplugging the monitor and try plugging it back in. If, as before, it does NOT give anything when the cable is disconnected from the system unit, then in your case the prerequisite for a black screen and a lack of response when you turn on the computer is a broken monitor.
You did the actions from the article?
Alexander, we tried to return the monitor back?
Hello. Yes, connector problems cannot be ruled out
The computer was disconnected from the filter. The power supply unit burned out, changed it to another, as a result of the PC, when the power supply unit is connected, it turns on immediately. the power buttons DO NOT respond, there is no image on the screen, and the card cooler does not spin, the green indicator of the system unit is working. There is no OS boot sound
Step 5. checking the card
So we have come to the point, which, according to many inexperienced craftsmen, considers it almost the most obvious in a situation where the monitor does not show an image, and the computer seems to be working. Under the word “working” implied rather “hums”. Because the fans are spinning!
In fact, this is not the case. The fans spin because they are simply supplied with voltage from the power supply. the card is rarely the culprit. but it’s still worth checking.
We try to get the card by unscrewing the bolt on the left, with which it is attached to the case, and pressed the special lever to the right near the connector in which it is connected.
We wipe the card contacts thoroughly with a soft cloth or eraser and try to insert it back. Ideally, try running it on a different, known working computer. If your motherboard has a built-in card, then try starting from it. If you still have one, then you can try to lend a card to your friends for verification.
I connected the TV as a monitor via vga the logo passes the test passes the computer is loaded and the monitor is black. With a native monitor, it’s normal. Crt TV monitor too. thanks.
Black screen when turning on your computer? what to do?
Black screen when loading Windows is a problem that sooner or later many users face, but not everyone knows how to fix it. What should be done? First you need to study the Possible Causes. There are many of them and they are different. They can be both technical and software, and sometimes the problem lies in the usual carelessness.
A laptop almost always has an output for connecting an external monitor. Therefore, if when you turn on the laptop you hear the sound of the coolers, but the screen is black, then it is likely that someone switched it to work with an external monitor. Locate the external monitor function keys on the keyboard and try turning on the internal display. This is how they look on an ASUS laptop:
The F7 key turns off / on the internal screen, and F8 controls the combination of output to the external / internal laptop monitor. They should be pressed together with the function key, usually denoted Fn.
This is how the choice of operating modes with an external monitor looks like in Windows 8 and 10.
Different modes are switched by sequential pressing of the Fn and F8 key combination for the ASUS laptop keyboard shown above. So you can accidentally turn off the laptop’s internal monitor and get a black screen when turned on.
The card is out of order
With such a malfunction, the laptop or PC fan works, but It does not start and we see a black screen on the screen. According to the POST standard, we should hear one long and two or three short beeps from the speaker (built-in speaker). The specified sound indication is typical for AWARD BIOS installed in many mainstream laptops and computers.
Just be sure to make sure that the speaker is present and connected to the board. In some modern computers, manufacturers do without it, replacing them with LEDs on the motherboard and even small digital indicators. But the latter can only be found in expensive motherboards for overclockers.
Incorrect refresh rate or too high resolution
The second common problem with a black screen when loading Windows may be the incorrectly set refresh rate on the card. The fact is that old CRT monitors operate at a high screen refresh rate, up to 100 Hz and higher. And modern LCDs can only support 50-60 Hz. This is due to the design feature of such monitors.
If you got a black screen exactly when switching from an old monitor to a new one, then you need to do the following.
- Connect the computer again to the old monitor.
- Set the refresh rate to 60 Hz and the minimum screen resolution. This can be done in the properties of the screen or a special utility of the card driver.
- Connect your desktop to a new monitor and adjust the screen frequency and resolution for the new display.
For the same reasons, you can get a black screen on a laptop connected to an external monitor. Try adjusting the frequency and resolution for the external display as shown in the picture above.
Problem with wires and / or connectors
Typical situation. problems with cables, connectors and power buttons.
System bootloader failure
A black screen and a cursor on it after loading a laptop or computer may indicate a malfunction in the operating system loader or one of the drivers. If the system startup options menu appears, try booting into Safe Mode. And if not, then there is only one way out. boot from a CD or flash drive. How to make a bootable flash drive is described in our article.
What if the black screen when the computer is turned on is defeated by the means described in this article, but it did not work out. Perhaps the reason lies in a malfunction of parts of your PC.
Checking the contact between card and monitor
The second prerequisite for a situation when coolers work, but the computer does not turn on and shows a black screen. there is a problem with the cable between the card and the display. There are two options here:
- The cable came out of the socket.
- The cable is not connected to the main output of the card.
With the first case, everything is clear. Just check the integrity of the cable itself and the reliability of its attachment to the connector. But with the second case it is worth explaining. Examine the back of your computer.
If there are two connectors for connecting the monitor cable, then we are dealing with one of the following situations:
- Installed card with two outputs.
- There is an external card (2) and an integrated internal (1).
In both cases, there are two options for connecting the cable. I turn off the computer, switch the wire to another connector and turn on the computer again.
Perhaps someone just switched the cable to a different socket by mistake. The modern HDMI connector is NOT equipped with screws, like the old VGA, and it can be accidentally pulled out of the socket, and then plugged into the wrong socket or not fully inserted.
Black screen after restarting computer? Perhaps you have a technical problem (more details below).
Checking the Monitor Power Supply
- If you have a desktop computer, first check the power supply to the display. Some users get so used to working on a laptop that, when they switch to a desktop, they don’t notice the obvious. The power button on the monitor is just off. It is not by chance that the instruction of IBM specialists, developed for the first PCs, suggested checking the power supply.
- The second common prerequisite for suddenly getting a black screen when turning on is insufficient power cable contact. In practice, there were often cases when the cable plug was loosely held in the socket, and turned off when the display was moved or the active participation of household members, including furry ones. In the office, a prerequisite for poor contact between the cable and the monitor is often the cleaning women touching the wires during cleaning.
Unscrew the monitor plug screws from the connector that supplies the signal from the system unit card, Remove it. If the inscription on the screen lit up: “Vs signal” (it may be in English), then everything is in order with the monitor. If it burned down, then even this inscription would NOT show.
If you have the option, try connecting your monitor to your TV. The easiest way to do this is with an HDMI cable.
What to do if there is no signal on the monitor when you turn on the computer?
Hello! Probably many of you have come across a situation where there is no signal on the monitor when you turn on your computer. Any PC user can face such a problem. But what can be the reason that the display remains dark when the system unit starts up? What to do in such cases? we’ll figure out.
If, when turned on, your computer boots up, makes normal sounds, a blinking red light on the front panel indicates ongoing processes, but there is an image, the operating system will boot and the computer will work normally, only you will NOT be able to see this, how you will NOT be able to use it. There are actually quite a few reasons that can be. Here are the main ones:
- malfunction of the monitor itself;
- there is a contact in the connector of the card with the monitor cable;
- BIOS “flew”;
- problems with the RAM board;
- the card is faulty;
- defective motherboard;
- defective computer power supply.
Consider how you can correct the situation or identify a breakdown in each of the cases at home.
Connector pins problem
The actions are the same as in the first case. The connector from the card to the monitor can be (in most cases) three types: VGA (blue), DVI (white-gray or black) and HDMI (Black). You can read more about connectors and other characteristics of the monitor here.
Unscrew the connector screws, Pull out the plug, insert it back and tighten again. Turn on your computer. If it doesn’t work, go ahead. Try plugging the cable into a different connector or using an adapter. Perhaps a banal replacement of the cable will help, i.e. if possible, be sure to try a different cord.
Perhaps we just met a loose connector, so press the plug and see if the result is.
The slots (connectors, in Russian speaking) of the modules (boards) of RAM are located, as a rule, the case of the processor (massively square with a heatsink and a fan). In any case, they cannot be confused with any other board. It can be one module for several gigabytes, or it can be several for 1 or 2 gigabytes.
Press the latches on both sides of the board by pulling it out of the connector. Clean the contacts thoroughly. An ordinary student’s eraser (Sterk) is suitable for this. Reinsert the module. Start the car. If the image appears, then the problem has been fixed. If not, it would be good to try replacing the RAM card with a new one. It can be borrowed for a while as a friend. Otherwise, you still DO NOT Make sure that your RAM is “normal”.
It is easier when there are several boards. Having taken out and cleaned everything in turn, do not put everything back together. Reveal non-working board by elimination method. Insert three, and then, in turn, change the boards. We put in three, turned on the computer. The display does not work. Turned off the computer. They took out one, replaced it with another, turned it on again. If in the process of THESE operations the display starts to show the load, and the board that remains NOT connected is inoperative. It should be replaced with a new one.
In the end, try using a different slot if the characteristics allow, as often the problem may be in it.
If everything remains unchanged and when the computer is turned on, the display remains dark, go ahead.
If the module is built into the motherboard, then you have a direct road to the service center. You will NOT be able to check it. If it is separate, you can replace it with another one. It happens that the built-in module is low-powered, and people purchase a separate, more powerful one. Although sometimes it will be enough to go over the contacts of the card with a brush. There are times that the problem lies in the settled dust.
Disconnect the monitor cable from the card connector. Remove the card from its slot. To do this, unscrew the fastening screw in the rear wall housing and squeeze the clip (plastic lock) on the right side (sometimes it may not be there).
Then connect the connector from the cable that goes to the monitor to the output of the built-in card, usually located higher. It is the same color and the same shape. Start your computer. If the image appears, the problem was with the removed card.
On motherboards without a built-in module, you can identify the malfunction by replacing it with another one. Also, as is the case with the built-in card, if people are not satisfied with the power of the module and they buy a more powerful one. Replace it with the one that stood before. If the image goes, your more powerful card is “covered”. If the display is “silent” further, then the problem is more global.
Otherwise, the software for oregano is called BIOS. If you have problems with it, you can easily return it to its factory settings.
Somewhere in the area of the card slot (sometimes higher, sometimes lower, depending on the characteristics of the oregano) there is a flat battery, from which the BIOS is “powered”. If this battery has NOT been changed for a long time (4 or more years), you can completely replace it with a new one. If the computer was purchased relatively recently, simply wring out the contact Remove the “coin” battery from the slot.
To reset the settings, you can short-circuit the contacts (to.) with a screwdriver or wait ten minutes. Then insert the battery back and start the computer. If the image appears, the problem is resolved. If there is still a signal to the monitor, then go ahead.
A malfunction of the motherboard or power supply can only be detected by handing over the equipment to a service center. Of course, “specialists” it will not be difficult to get a power supply on the side and try it by reconnecting all the connectors. But it is better to entrust these procedures to real masters. But never contact the ad masters! This is such a game. They will rip you off at exorbitant prices, and the repair will be questionable.
Well, this is where I end my article. I hope that it was useful to you and the information presented in it helped you to cope with the problem. Don’t forget to subscribe to my blog as well as my social media. Good luck to you. Bye Bye!