6 Simple Ways to Fix a Monitor When It Shows No Signal

Fix your PC turning on with no display

Co-authored by Luigi Oppido and Rain Kengly

Last Updated: August 18, 2024 Fact Checked

Are you getting no video on your monitor, even though it's connected? This is usually due to a faulty cable or incorrect settings. Luckily, there are a few easy fixes to try. Here's what to do when your computer monitor has no signal with expert tips from Computer Specialist Luigi Oppido.

Why Does My Monitor Say No Signal?

If your monitor says No Signal, it isn't receiving the video signal from your computer. To fix this, check the video output, cables, and ports. If you have a separate GPU, make sure the monitor is connected to the GPU rather than the motherboard.

1

Check the video output.

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Similar to TVs, some monitors allow you to have different sources connected. Use the physical buttons on your monitor to cycle through each output.

2

Make sure it's connected properly.

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Confirm the monitor cable is in the correct port. If you have a separate GPU, you will need to plug your monitor cable directly into the GPU rather than the motherboard. This port is commonly found on the back of the PC tower, below the motherboard ports.
- If the cable is in the correct port, make sure it's snug against it and not loose.

3

Physically check the ports.

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Look for dust and debris in the port. Additionally, look for any damage to the cable itself. This can prevent the video from being transmitted properly.
- If it's dusty, turn off your computer and unplug everything completely before you clean it.

4

Try a different cable.

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Some monitors may require a newer cable. If it's an older monitor, it may require an older cable.

5

Boot your computer in Safe Mode.

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Use Safe Mode on your computer. If your monitor isn't displaying properly but can load Safe Mode, it's most likely your resolution.
- While in Safe Mode, choose a low resolution and restart your computer. When you're back in again, open your Display settings and select the recommended resolution.

6

Check your projection settings.

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If you're using a monitor with your laptop, change your projection settings. Some devices won't automatically mirror your original screen; you'll need to change this manually.
- On Windows, press Windows + P to select Duplicate, Extend, or Second screen only.
- On Mac, click the Apple menu > System Settings > Display > display name > Use as.^{[1]
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- On some devices, you may need to open the port first. Oppido advises to look for a key with a "little hieroglyphic that looks like two boxes with a slash in between them"^{[2]
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  Expert Source
  
  Luigi Oppido
  Computer & Tech Specialist
  
  Expert Interview} and press it. You may need to hold down the Function key to activate it.