Can’t see the monitor when you turn the computer on
What to do if the monitor doesn’t turn on
Often the cause of the problem is not the display itself, but the computer. Check each option and take care of the problem yourself.
Before proceeding to further diagnostics you need to make sure that the monitor is getting power. This is indicated by the LED on the front panel which should be illuminated or flashing in one of the colors.
If the light does not come on, check the power buttons on the monitor and extension cord: maybe someone or yourself accidentally pressed them while cleaning and didn’t notice.
If everything is OK there the problem may be in the cable. On the side of the plug it is fixed in the socket quite accurately and reliably, but in the monitor’s power plug it simply plugs in. Maybe the wire is slightly dislodged in the socket and the contact is broken.
Try plugging it in a little more and check the indicators. The problem may be with the cable itself. To exclude them, replace the wire with another, for example from a computer power supply. they fit (unless it’s a model with an external adapter).
What to pay attention to, if the monitor doesn’t turn on
Even if you don’t have a monitor connected to your PC (in case. video plug/cable has come loose). nevertheless if the monitor is powered. the LED on its housing should be on (blinking) (and on the screen at least for 1-2 seconds). flashes a message from the manufacturer and possible info., that there is no video signal. ).
The monitor is plugged into a 220V power outlet
Therefore, the first thing you need to make sure of: whether the monitor “sings” of life. if the power indicator on its case is lit. Try to disconnect it from 220 V mains, wait 1-2 min., and plug it in again.
- Check if your monitor is plugged into the socket and if your other appliances are working from it;
- see if the surge protector isn’t knocked out (if it’s on);
- As a rule on the monitor there is a button for switching it on./off try to push it a few times (to see if anything changes on the screen?);
- It is a good idea to check the cable (power supply, if available) with which the monitor is connected. to the 220 V mains.
Actually if the monitor is not powered all other steps in this post will be useless for you (and it’s almost certain that it has the same problem as the power adapter). There is a malfunction, and without the “repair” there is no way. ).
Incorrect connection of the connection cable
The problem is. The second most frequent reason which serves as the answer why the monitor does not turn on is the mistake of the user when connecting the monitor with the PC cable. If the cable is connected in the wrong socket or the connection is of poor quality you will not see the picture on the monitor.
The solution is. Make sure you have connected the cable to the right port (especially true for those users who have two video cards: discrete and built-in). It is the discrete graphics card which needs to be connected to the monitor, as its connector is usually located a bit lower.
Also check the quality of the connection. To do that you need to remove the cable, clean the connector from dust and debris and plug it in again. Besides there is a possibility of breakage of cable itself, so if you have possibility try to use another cable for connection.
Checking video cable connections
Firstly check the tightness of the cable in the connectors of the monitor and the system unit. Be sure to check the pins in the connectors for bending. Sometimes pulling the cable suddenly from the side will bend those pins. When connecting later, the user may apply excessive force and bend the pins. So be sure to check them when connecting.
Next, let’s check the cable for kinks. To rule out this possibility, connect another similar cable to find out if it is to blame for the monitor not working. Problems with broken or shorted wires in the cable manifest themselves long before its failure. the monitor begins to hum in one color (green, blue or red) when you turn it on, and the background changes when you bend the cable in one found place. In this case you need to urgently replace the cable, otherwise it can cause damage to such an expensive component as video card.
If you have two video cards (integrated and discrete) installed in the system unit, check whether you connected the cable to the right connector. When you buy a complete computer with discrete graphics card installed the integrated one is disabled in the BIOS setup, if you incorrectly plug it into this slot the monitor will not turn on.
Diagnostics and Cure
The thing is that there are situations when the system does not start up immediately but takes a long time to “think”. But then (after 2-3 minutes) the picture on the screen appears, the download continues. Therefore, it makes sense to wait a bit. If the screen says “No signal” and nothing happens for a few minutes, it is worth to proceed to active actions.
It is not necessary to remove the cover right away and look for the breakage with your eyes. First of all we have to narrow down the “circle of suspects”:
- To exclude the monitor from the list of causes is simple: connect it to another “system computer”, a laptop. If the image appears. so keep looking for faults inside the PC.
- Press the power button on the system unit. You have heard the characteristic squeak that you used to hear during normal PC startup? If there was nothing, then the problem is definitely inside the computer.
- Check the flat cable, which connects HDD to the chipset. Both ends must be pushed tightly into the slots. At the same time look through the power cable connected to the HDD.
- Pay attention to the noise of the fan installed on the power supply. Is it present or not? If only silence, no humming, it means that the PSU does not work. But there is another, very trivial reason: someone has unplugged the power cord or pulled it out of the computer. If there is a power on button on the back of the case it is worth checking it too.
- If the motherboard has an integrated graphics card, try connecting to it. If the monitor “comes to life”, then the defect is related to the discrete video adapter. You should remove the lid and see if the cooler on it rotates (if there is one). It is possible that the motherboard is loose or the contacts are dirty. pull it out of the slot and clean the contacts with a cotton swab soaked in alcohol (or a regular eraser). Didn’t help? It means that graphic card needs to be repaired/replaced.
- Often the monitor blinks or does not work during the start of the computer because of the memory cards installed on the motherboard. Maybe one of them “burned out” or a little loose, clogged contacts. You need to pull out, try to swap the cards, clean them with an eraser, as in the case of the video card (see above).
I’m sure you were able to identify and fix the problem. The monitor is working? Share your story in Комментарии и мнения владельцев. If the steps mentioned in the instruction did not help it is possible that you need to take the computer to service, because you are dealing with hardware malfunction. It’s better not to take any actions at home, without special tools and experience.
It sometimes happens that the monitor doesn’t work and shows no picture, even if the computer is turned on and everything seems to be OK.
If all previous recommendations didn’t help then we can assume that the monitor itself is broken.
First of all try to rule it out or confirm your assumption. To do this you need to connect the display to another computer. If there the picture will be similar, the diagnosis is confirmed.
But there is an option that allows you to test the functionality without another computer. To do this you need to disconnect all the wires from the monitor, and leave only the power cord. Then turn on the device. If the display is functional, then the screen will display a notice that there is no signal, or some other message. This may have been the CPU’s fault. So it is not the monitor that is faulty, it is working fine. And why it does not turn on, you need to ask the system unit.
When the test shows that the screen is still black, the indicators on the case do not light up, then the monitor has given up its life. You need to look for a service center, to take to the diagnosis and pay for repairs. Yes, some users can open the case, re-solder pins and replace capacitors by themselves. But the task is not the easiest. It is better to rely on experienced masters, if personal skills are not enough.
The computer works, but there is no picture on the monitor
Restart your computer with Reset button on the system unit or by pressing the power button for a long time (more than 10 seconds). The computer should shut down and power cycle should be repeated in a traditional way. If during booting different informational messages appear on the monitor screen. the monitor is fine and the cause is hidden in the system unit. If booting is interrupted before the startup “windows” appear. Repair or reinstall the operating system. Don’t forget to save important data from the hard disk to the backup media before performing such manipulations.
If the computer keeps booting and there is no information on the monitor. check the monitor and cords by replacing them with known good ones. If when connected to the working monitor the image and did not appear. the cause of its absence most often are the video card, “motherboard”, memory modules or power supply. To determine the faulty component you can take turns replacing defective ones or check the ones you have on another computer.
Another reason for the lack of images after turning on the computer may be overheating of the processor or video adapter. In this case the computer shuts down while it is still booting. If you are tech-savvy, remove the side cover of the system unit and carefully inspect the installed components and cooling system components. Vacuum the “system box” from dust, check the reliability of power connectors and equipment in the PCI slots.
Check power supply.
Really, power supply unit malfunction may be the reason that the computer does not turn on or rather it turns on, but maybe it does not have enough power and only blinks and the monitor does not turn on. So you should definitely check the power supply for performance, fortunately yours, a very useful post written by Dmitry Shemyakin on his IT blog, which will help you to check the power supply.
Of course, it’s a shame, but this situation happens quite often, it seems and checked the contacts and cleaned from dust and reset BIOS, but nothing works. The thing is that may be failed motherboard or graphics card. Before the failure it was necessary to diagnose the video card for serviceability, when it only hinted at failure.
That’s all for today, I told you how to solve the problem if the monitor does not turn on when you start your computer, be sure to subscribe to the blog for updates not to miss the following materials.