Member Avatar for reeshabh.daani.7

my monitor is ok [when turned on, shows logo of mfr.], shows no signal afterwards,

motherboard looks ok, after booting smps is on, cpu fan runs, hard disk led is on, there is no beep, no display.
after running for about 1 minute, motherboard re-starts on its own. and keeps re-booting on its own. [cpu fan and smps stop, and re-start again, so i can guess mobo is re starting. - no other way to conclude]

what could be wrong ?

reeshabh2006@yahoo.co.in

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  • Latest Post Latest Post by kategirdlelock

Dani AI

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Building on 's report and the brief replies from and , here is a concise, prioritized diagnostic checklist and safety notes to isolate the fault without needless parts-swap or expense.

  • Quick verifications: confirm the monitor and cable/input selection by swapping the cable and/or using a different display. If a discrete GPU is fitted, test the board using the motherboard video output (or vice versa). Confirm a system speaker is present — many cases lack one; a cheap PC speaker makes POST codes usable.
  • Minimal bench boot: with mains disconnected, remove drives, extra PCI cards and all but one RAM stick. Reconnect power and try to POST with only CPU, CPU cooler, 1 RAM stick and video (if required). Reseat memory and try each module in the primary slot. Note any beep pattern or LED POST codes.
  • Power and thermal checks: verify the 24-pin ATX and 4/8-pin CPU power leads are fully seated. Inspect the board for bulging capacitors, scorch marks or loose connectors. The ~1-minute auto-restart behavior commonly indicates PSU protection, a short, or thermal shutdown — swapping in a known-good PSU or using a PSU tester is a safe next step if available.
  • BIOS/CMOS and CPU cooling: clear CMOS (battery out a minute or jumper) and confirm the CPU cooler is correctly mounted with thermal paste. If comfortable and experienced, reseating the cooler can rule out poor contact; otherwise leave this to a technician.

If the machine still shows no POST with a minimal configuration and a known-good PSU, the fault is likely the motherboard or CPU and professional repair or part replacement is warranted (as suggested). Always disconnect mains before touching components and use proper ESD precautions; live-voltage tests should be left to someone with the right tools and experience.

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Member Avatar for rubberman

Take or send it in for repair. It appears to be a hardware problem - the auto-restart is a good indicator of this.

Member Avatar for kategirdlelock

I agree with rubberman

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