Member Avatar for kretzj

My XP Monitor boots "green" light... but within seconds the light goes "yellow" and screen is black. Any suggestions? Many thanks.

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Short primer and next steps (building on and ): an LED that goes from green to yellow usually means the monitor is powered but not receiving or displaying a usable video signal (this is the behavior defined by the VESA DPMS standard). If the quick green->yellow->black cycle happens even when the PC is connected, run a few isolation checks before assuming the monitor or PC needs major repair.

  • With the video cable disconnected, power the monitor and press its menu/OSD button. If the on-screen menu appears, the monitor electronics and power are likely okay; the fault is between the PC and display (cable, GPU, or video mode).
  • With the PC connected and power on, shine a strong flashlight at the screen at close range. If a very faint desktop or login image is visible, the panel itself is OK but the backlight/inverter has failed.
  • Swap the video cable and, if possible, test the monitor on a different computer (or try a different monitor on the PC). Check connector pins for damage and try alternate input ports.
  • Power-cycle the monitor: unplug it, hold the power button ~10 seconds, then reconnect. Listen for unusual noises or look for signs of failed capacitors (bulging/leakage) if inspection is safe.

If the OSD never appears and the flashlight test shows nothing, the monitor likely needs service (internal PSU/logic board) — repairs on older units often cost more than replacement. If the display appears under a low/diagnostic boot (as noted earlier), focus on GPU drivers, cables, or refresh/resolution settings. For background on standby behavior, see VESA Display Power Management Signaling.

Caution: internal monitor repair exposes high-voltage capacitors. Do not open the monitor unless experienced or trained.

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Member Avatar for jbennet

On startup hit f8 repeatedly until you get to a menu. Choose safe mode

Does it work then?

Member Avatar for LabASSistant

did you try to reseat the boards and blow the case out?

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