How to fix a monitor that won’t turn on?


We often get asked ‘How to fix a monitor that won’t turn on?’

1. Check your monitor’s connections

To begin with, your computer may not be broken at all. The first and simplest test is to determine if the problem is with your monitor or the connections between it and your computer.

2. Check the wall socket

If your screen is still black, see if the problem can be resolved by plugging in the monitor to a second outlet. Still no luck? You’ll need to go on to the next troubleshooting stage if this fails.

3. Check your monitor’s backlight

When your computer is on and the screen is entirely black, shine a light directly onto it with a torch. If you can see an image using only touch, the backlight on your monitor is probably broken, and you’ll need to replace it. This isn’t something anyone without technical repair knowledge should attempt alone because if you break your screen.

4. Check if it’s a problem with your PC

If none of the above-listed troubleshooting options has solved your problem it’s now time to test if you can rule out the problem being with your computer and knowing that it is a problem with your monitor or connections to your monitor.

5. Try with another monitor

If you have another monitor accessible (perhaps from a different computer in your house or even friends), utilize it to check whether your current monitor is defective. Simply unplug the device connected to your present monitor and connect the second monitor, which you know works. I’d use the other power cord and cable to do this.

If the second/replacement monitor turns on, you can safely eliminate this as a cause of your computer’s problem.

6. Check the monitor’s adapter

The next step is to look at the supply of power to the monitor, including the cable. Some monitors are built with an internal or embedded power supply, while others are powered externally (similar to a laptop).

If the power supply of the second monitor is interchangeable, I’d connect it to the first monitor’s power supply. If you notice that the screen still lights up, then there’s something wrong with the power supply.

If the screen does not light up, there is generally a simple remedy that does not cost much. Your option may be to buy a new power adapter. However, before you go out and get a new screen power supply, first reconnect your original monitor to the second monitor’s power supply and see if it works.

However, if this does not solve the problem, you may need to replace other components in addition to the power supply.

7. Make sure you have plugged in the right cable

This is simply a test to ensure that the power supply is working properly. Just make sure the cable’s connections to your computer and monitor are secure and durable. If your screen still works after you’ve tightened these up, you’ll feel silly, but it will provide excellent results.

If this doesn’t work, try swapping the cables to see whether there’s a problem with the cable. If you have a computer and monitor that support a range of connection types, consider VGA (15 pin blue), DVI, or DL-DVI-D (white). If replacing your cable solves your issue, this is the easy solution

If the screen remains dark, you may have a defective monitor that is best replaced rather than attempting to repair it. If you haven’t ruled out that your computer is faulty rather than the display, move on to the next phases of troubleshooting why your monitor won’t turn on.

8. Check the graphics card

If you have no prior experience repairing a PC, opening up your computer to examine the graphics card is probably a task for a technician.

If you have the expertise, take out the graphics card and reset it in the PCI-e slot (or another PCI-e slot if your motherboard has more than one). If this does not work, then it is possible that your computer’s motherboard is broken.

9. Computer Motherboard

You can exchange motherboards to see whether this is the reason your monitor’s screen is black. This requires a large amount of work, and it’s not for those with little or no technical knowledge.

You can also try plugging in another computer or laptop to see if you get any display.

If you’re having trouble with a certain program or game, search the internet for an uninstaller. There are plenty of free uninstallers out there, so it’s easy to find one that works with your operating system and model. If nothing else works, maybe you should start over with something simpler. The RAM modules in your computer may need to be replaced.

If after all of this troubleshooting you still don’t have a solution to your issue, get in touch with a local IT technician.

Related: Why Won’t My Benq Monitor Turn On?

I am a computer engineer holding a bachelor's degree in Computer Science, complemented by a Master's in Business Administration from University of Strathclyde, Scotland. I currently work as a Senior IT Consultant in Melbourne, Australia. With over 15 years of...