PlainError

Monitor shows No Signal or No HDMI signal when PC is on

Last checked 2026-10-26 · 3 fixes · reviewed answer

TL;DRThe monitor is powered on but receives no video signal from the PC, even though the computer itself appears to be running. This is usually caused by a loose or incorrect cable connection, the monitor set to the wrong input source, or a problem with the graphics output from the PC.

Most likely cause: Cable not fully seated or connected to the wrong port on the PC or monitor

Try first: Check and reseat the video cable

Likely causes

  1. Cable not fully seated or connected to the wrong port on the PC or monitormost likely
  2. Monitor input source set to the wrong option (HDMI, DisplayPort, etc.)most likely
  3. Faulty or damaged video cablepossible
  4. Graphics card or port not outputting signal (driver or hardware issue)possible

How to fix it

Safest first: SafeChanges settingsDangerous

  1. Check and reseat the video cableSafe

    Power off both the PC and monitor, unplug the HDMI or DisplayPort cable from both ends, then firmly plug it back in on the PC and monitor. Make sure it clicks into place.

  2. Select the correct input on the monitorSafe

    Use the monitor's buttons or joystick to open the input/source menu and choose the port the cable is plugged into (HDMI 1, HDMI 2, etc.).

  3. Try a different cable or portSafe

    Swap to another HDMI or DisplayPort cable if available, or try a different port on the PC and monitor.

If that didn't fix it

Shut down the PC, remove the side panel, and reseat the graphics card in its slot if it is not integrated graphics.

When to see a technician

If reseating the graphics card and trying different cables and ports does not restore the signal, have a technician test the graphics hardware.

Quick answers

What does Monitor shows No Signal or No HDMI signal when PC is on mean?
The monitor is powered on but receives no video signal from the PC, even though the computer itself appears to be running. This is usually caused by a loose or incorrect cable connection, the monitor set to the wrong input source, or a problem with the graphics output from the PC.
What causes Monitor shows No Signal or No HDMI signal when PC is on?
Cable not fully seated or connected to the wrong port on the PC or monitor. (most likely) Monitor input source set to the wrong option (HDMI, DisplayPort, etc.). (most likely) Faulty or damaged video cable. (possible) Graphics card or port not outputting signal (driver or hardware issue). (possible)
How do I fix Monitor shows No Signal or No HDMI signal when PC is on?
Try these in order, safest first: 1. Check and reseat the video cable. 2. Select the correct input on the monitor. 3. Try a different cable or port.
What if that didn't fix it?
Shut down the PC, remove the side panel, and reseat the graphics card in its slot if it is not integrated graphics.
When should I see a technician?
If reseating the graphics card and trying different cables and ports does not restore the signal, have a technician test the graphics hardware.
Did this fix it? Report a problem

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