HW-014

No Display

Hardware / Video output / Desktop PC + external monitor / Rev 1.0
1 / What happened

The desktop has power, but the monitor shows no image.

Symptoms
Fans spin / power light on / screen blank
Applies to
Desktop PC with separate monitor
First rule
Check monitor, input, and cables before opening the PC
2 / Why it happens

Most cases are monitor power, wrong input, loose cable, or a hardware fault. Start outside the case.

3 / Diagnose

Is the monitor getting power?

  1. Check monitor power light.On: move to signal checks. Off: keep checking power.
  2. Press monitor power once.Do not hold buttons or change menu settings yet.
  3. Follow the power cable.Check the monitor end, wall socket, and power board.
  4. Test the wall socket.Use a known-working low-risk device such as a phone charger.
4 / Fix safely

Restore monitor power

Do not open a monitor or power board. Replace, do not repair.
  1. Reseat the power cable at the monitor and wall.
  2. Bypass the power board if safe and allowed.
  3. Move to a working wall socket if the socket is dead.
  4. Swap the monitor if it has no power on a known-good socket.
  5. Verify: image stays visible for one minute.
5 / Document it

Use short ticket notes. State symptom, checks, action, result, and what was not changed.

User reported desktop has power but monitor shows no image.
Confirmed desktop power light and fans active.
Checked monitor power and selected input.
Checked video cable at monitor and desktop.
Reseated HDMI cable.
Display returned after input was changed to HDMI 1.
No internal hardware changes made.
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