Member Avatar for PHIPH

hello guys my pc blacks out after few seconds a start up but the motherboard
shows that its receiving power so i don't know the exact problem

Edited by PHIPH because: n/a
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Thread context: reports a Windows XP desktop that powers up but the screen goes black after roughly a minute while the motherboard still shows power. Replies from , , and covered software and basic cable/thermal checks; the checklist below focuses on hardware-level steps and diagnostic clues not yet described.

First, determine whether POST (BIOS) completes. Watch fan and HDD activity LEDs and listen for beep codes at power-up. If the BIOS screen is visible and then the image is lost later, the fault is likely downstream of POST (GPU, PSU rail collapse, or an OS/driver failure). If the display disappears before or during POST, suspect power delivery or the motherboard itself.

Isolate by minimal-component booting on a cold, unplugged system: leave only CPU, one known-good RAM stick (test each module and each slot), and minimal video hardware (use onboard video if available). A single bad DIMM or slot often causes early failure; intermittent RAM faults can produce the described timing. Substituting a spare GPU or testing with onboard video is a fast way to separate graphics failures from motherboard/PSU problems.

Power-supply and board inspection: intermittent rail failure is a common cause of brief successful power-up followed by blackout. Use a PSU tester or a known-good spare PSU to verify stable 12V/5V/3.3V rails under load. Visually inspect the PSU and motherboard for swollen/leaking capacitors, burn marks, or unusual odors. If any physical damage is present, avoid extended powered testing; bench replacement of the PSU is a low-cost first step. If spare parts or test equipment are unavailable, professional bench diagnostics will identify whether the PSU, GPU, RAM, or motherboard is failing.

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Member Avatar for rch1231

If you are running windows then try starting in safe mode. It could simply be your video driver being in the wrong mode for your monitor. If not what OS are you running and how far into the boot does the system go?

Member Avatar for cwarn23

Perhaps you should check for loose connections on the monitor and on the cable connecting into the graphics card. If that doesn't work then download the ubuntu live cd then insert the ubuntu live cd and boot from the ubuntu live cd to see if it's a software or hardware falt. If the screen goes black when booting from the ubuntu live cd it means some hardware will need replacing however, if the ubuntu live cd loads fine then you will need to insert the windows installation cd and do a disk repair.

Member Avatar for jingda

It could well be an overheating issue as well.

Member Avatar for PHIPH

Am running windows XP, When booting it takes like a minute without displaying anything and after it blacks out

Member Avatar for jingda

Try cleaning the dust away on the heatsink and fan. If your PC is old, you might want to apply a new thermal paste between the heatsink and the CPU.

Edited by jingda because: n/a
Member Avatar for caperjack

as rch1231 said try safe mode ,hitting f8 on start up ,choose safe mode

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