If you use an external monitor for your work computer or home PC, you may find it useful to know how to troubleshoot some common monitor and connection issues. Here are some easy fixes for a no-signal error message on your monitor. You can try these before resorting to tech support or purchasing a brand new computer monitor.

Why Is My Monitor Showing No Signal?

Here are some of the most common issues that crop up when your monitor says no signal even though your PC is on. Some of these are relatively easy to check and correct.

Incorrect Input Source

If your monitor has multiple input channels, make sure the correct input source is selected. When connected to a PC using a video output or HDMI cable, for example, check to ensure the monitor input is set to the correct source, ie, HDMI or Video. You can usually do this through the monitor’s main menu or control panel, pressing the menu button until you find the input button, then select the input button to cycle between settings until you get the correct video signal.

Cabling and Power Problems

This may seem obvious, but the answer may be to check all wired connections and make sure the input device is powered on. Check your video monitor cable or HDMI cable and make sure it’s firmly connected to the PC or other input device and to the monitor. If you’re using a desktop tower PC, make sure the device is powered on. Some PCs may have cooling fans that spin and thus make noise when the PC is not booted up yet. So be sure to check if the power light is on and that both the monitor and PC are connected to a power supply. This is a good strategy if you ever find that your monitor is not turning on properly as well. Check the condition of your power cord. A faulty power cable or power strip can sometimes cause this display issue. Always use care when handling a damaged or frayed power cord.

Warning: Some PCs may have cooling fans that spin and thus make noise when the PC is not booted up yet

Tip: Always use care when handling a damaged or frayed power cord

Check the Condition of your Video Cable

If you’re using a cable to connect to your monitor, you might be getting a no input signal message on the display due to a faulty or damaged video or HDMI cable. Check all display and device cable connections, inspect for visible damage, and if necessary, replace any damaged cables with a compatible video cable.

Monitor Resolution Settings

Some external display monitors will show no image and an error message if the monitor display resolutions are out of sync with the input signal. If your PC video card or graphics card is set to a display resolution higher than the native display resolution of the monitor, the monitor may show a “no input signal” message. Consult your monitor specs to find out its maximum and native resolution. If you’re not sure, and you have a Windows PC, you can try booting up in safe mode, which uses a much lower display resolution.

Warning: If your PC video card or graphics card is set to a display resolution higher than the native display resolution of the monitor, the monitor may show a “no input signal” message

Graphics Card Issues

If you’re using an interchangeable graphics card, make sure the graphics card is firmly inserted in its slot. Make sure you disconnect all cables and confirm that the device is powered off before removing an internal graphics card. A bad video card or incompatible video card driver may cause a display device to show an error message. Never remove the cover of a PC while the device is powered on.

Tip: Make sure you disconnect all cables and confirm that the device is powered off before removing an internal graphics card

Warning: Never remove the cover of a PC while the device is powered on

Update Your Graphics Card Drivers

Alternatively, you may need to update your graphics card driver. A faulty or out-of-date graphics card driver can cause a no-signal message to appear on a connected external monitor.

Test With An Alternative Monitor Or PC

Another way to troubleshoot a monitor is to connect to another computer or device. If you connect your monitor to another device with known video output and the problem persists, then the fault is likely with the monitor. Conversely, if the monitor works when connected to different video inputs and is able to receive an active video signal from another device, the fault may be with your PC or it might be a software issue.

STAT:

The most common monitor resolution in use worldwide is 1920×1080, with just over 21 percent of market share as of January, 2021.

Until 2003, nearly all monitors used a VGA port to connect to their input devices. VGA is an analog standard first used in 1987.

Display Port cables are capable of transmitting a 4k signal at up to 144 Hz.

Sources:

Support.hp.com

Dell.com

https://www.sony.com/electronics/support/articles/00231275

*https://www.youtube.com › watch

“Introduction—Monitor Technology Guide”. necdisplay.com. Archived from the original on 2007-03-15.

“Desktop Screen Resolution Stats Worldwide”. StatCounter. Retrieved 2020-07-16.

https://www.xenarc.com/different-types-of-monitor-ports.html

How to Fix No Signal on Computer Monitor FAQ

Why does my HDMI 2 say "no signal?"

Typically, a monitor displays a message "no signal error" when there's a problem such as a loose cable, loose connections, or a problem with the input device. Graphics driver and output resolution problems can also cause this error.

Is the monitor input source correct?

You can check the monitor input source by selecting the main menu either via the monitor's control buttons or the remote control, then toggle through video input options until you can select the correct input source.

Ryan Mcbride

Ryan McBride is a writer based in Los Angeles. He has contributed work to magazines and sites including Gayot, Spy, Paper, Ladygunn, 3AM and the Crab Creek Review. He writes consumer reviews, essays, science and tech journalism as well as literary and art criticism.

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