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I've been employed to fix a friend's PC troubles and apparently his monitor automatically goes into "sleep" mode whenever the CPU is turned on. Once it passes the initial loading stage (Where the "DELL" screen shows up and the loading bar fills) it goes into sleep mode.

I've tried removing the battery and waiting five minutes (I've removed the battery again and am currently waiting fifteen minutes) but that doesn't help. He's given me the go ahead to wipe the PC itself and I've put the CD in, it boots up from the CD but as soon as Windows begins copying files (the initial stage after it checks system configuration) it goes into Sleep Mode again.

What else can I do to fix this issue?

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A short note: ’s problem was resolved when the CMOS battery was reseated, which is worth calling out because the symptom — BIOS splash appears, then the monitor immediately goes to “sleep” as Windows starts — often means the monitor has lost the video signal rather than the screen itself being dead. Below is a concise explanation and a practical checklist for anyone who finds the same behavior.

Monitors go to sleep when they stop receiving a valid sync/signal. The BIOS splash uses basic timings that almost every display accepts, so you’ll see it; later the system reinitializes the graphics adapter (or switches outputs) and a loose contact, flaky video cable, or a board-level initialization problem can make the signal vanish. A CMOS battery that isn’t seated properly can cause BIOS mis-initialization or intermittent behavior that looks exactly like a disappearing video signal — it’s not the only cause, but it’s a quick, non-destructive thing to check.

Quick troubleshooting checklist (safe order):

  • Power off and unplug the PC and monitor; ground yourself before touching components.
  • Check the monitor’s power LED and OSD text — “No Signal” means loss of sync; a dead LED indicates power.
  • Swap the video cable and, if possible, try a different monitor to rule out the display/cable.
  • Boot to BIOS and leave it there: if the picture stays, the problem is happening later in POST/OS init (drivers/OS); if it drops in BIOS, it’s hardware-level.
  • Reseat or replace the CMOS battery (CR2032): remove power, press the battery fully into its clip, or replace if old.
  • Reseat the GPU and RAM and check any GPU power leads; test with onboard video or another graphics card if available.
  • If the issue persists, test the PSU and try known-good components.

Safety note: always disconnect mains and discharge capacitors before working inside a case, and avoid static. The fix here was simple and mechanical; when a symptom looks like a disappearing video signal, start with cables, seating, and the CMOS battery before more invasive repairs.

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EDIT: I guess the first time around the CMOS battery hadn't been pressed in all the way or something, as the monitor is working just fine now.

TOPIC CLOSED. :D

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