PC turns on but shows no display? 5 checks to try

Fans and lights show that the PC is receiving some power. Note whether you see no signal from the moment you turn it on, or whether the picture disappears only when Windows starts. The checks below focus on no display at power-on.

1. Check the monitor, input and cable

Make sure the monitor can show its own menu, then select the input you are using. Reseat both cable ends and try a known-good HDMI or DisplayPort cable. A second screen or another source helps isolate the fault.

2. Check the graphics output

On a desktop with a dedicated graphics card, start with the card’s video outputs. A motherboard port usually needs a processor with integrated graphics and compatible settings. One working output can narrow the fault to an output, cable or configuration. It does not by itself identify a failed card.

3. Look for memory or graphics diagnostics

Record any diagnostic lights or beep pattern and look up the exact model. If the issue began after changing RAM, shut down and unplug before checking that the modules are seated in the recommended slots. Only test one module at a time if your manual supports it.

4. Check recent firmware and hardware changes

Check whether you recently changed BIOS settings or installed a CPU, graphics card or memory. Verify compatibility before changing more settings. If the board has a reset procedure, read the manual and save the BitLocker recovery key first if applicable.

5. Check power connections or get help

Loose internal power connectors can prevent startup even with fans spinning. Only inspect accessible connections with the PC unplugged and according to the manual. Stop if you notice smoke, a burning smell or damaged wiring. Never open the power supply.

If the picture disappears only after Windows starts, see Microsoft’s Windows blank screen guide.