Member Avatar for nickson.tabalno

Yesterday, i changed my processor to my older one because i want to try if it is working then suddenly when i return my processor to my orginal one, my computer doesnt work anymore, it suddenly shut itself down after 5 sec.

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A focused troubleshooting checklist for (system powers on then dies ~5 seconds after swapping CPUs). Replies from , , and raised board, firmware and cooling possibilities; before buying or doing anything invasive, work down this short, inexpensive isolation flow.

  • Observe power behaviour carefully: do fans and LEDs come on, then stop? That pattern often means the supply or the board’s protection is tripping. If possible, test with a known-good PSU or a PSU tester and verify the main rails with a meter.
  • Breadboard the board: remove the motherboard from the case and boot on a non-conductive surface with only PSU, CPU, one stick of RAM and required video. This rules out case shorts and bad peripherals.
  • Memory isolation: try one DIMM at a time in the recommended slot and swap sticks to rule out bad RAM or a bad slot.
  • Inspect the CPU/socket area: under good light or a magnifier, check for bent pins, debris or a misaligned CPU. Damaged contacts can cause immediate shutdowns.
  • Front-panel header and power switch: disconnect the case power switch and momentarily short the two power pins on the header to eliminate a faulty switch or wiring short.
  • Capture diagnostics: attach a speaker or read onboard LEDs/Q-codes and look up the exact code in the manual — that points to the failing subsystem.
  • Verify processor support: confirm the exact CPU model is listed on the motherboard’s compatibility/support list before assuming firmware alone is the issue.

If these steps don’t isolate the fault, the remaining suspects are PSU, CPU or the board’s power circuitry. Swap one part at a time into a known-good system (or have a bench test done) before replacing hardware. Use anti-static precautions and avoid forcing connectors or pins.

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Member Avatar for Marton123

May be because of some interconnection, try it replaceing motherboard with another one

Member Avatar for Rik_

Before going to the expense of a new motherboard, try clearing the cmos first. The old CPU may have changed some timing settings in your bios.

Member Avatar for caperjack

it shut down in 5 sec ,sounds like heat problem ,make sure the cpu has some thermal past left on it and the heatsinc is connected properly,

Edited by caperjack
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