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incogneato
Jun 4, 2007

Zoom! Swish! Bang!

My computer stopped booting recently, and I suspect it's either the motherboard, CPU, or both. They're aging, so it's not a shock. I'm just looking for some confirmation before I go and buy replacement CPU, ram, and motherboard. Due to the age of the motherboard, replacing one will mean replacing the other I think.

Problem description: As of last weekend, computer will not fully boot. Pressing the power button causes lights and fans to fire up for ~1 second, then power down. It then keeps retrying, stuck in a cycle. Possible likely cause is me flipping the room's breaker (actually the house main breaker) while working on some electrical stuff. I had forgotten that my computer was plugged in and asleep.

Attempted fixes: I verified that all fans spin (briefly) at startup. No visually obvious issues on the motherboard itself (although I'm only vaguely aware what to look for). I swapped in a PSU from a different computer, and nothing changed. I unplugged the GPU, all but one hard drive, and all but one stick of ram (then swapped that for a different stick). Same outcome.

Recent changes: None of note. PSU was replaced about 8 months ago, but it has seen quite a bit of use since then, and it's a good quality PSU. I also moved recently, but handled the moving of the tower myself, and it was working fine for the few weeks immediately after the move.

--

Operating system: Windows 10 64x

System specs: Computer is home built. Brand new PSU (Corsair with more than enough power). New-ish GPU (Nvidia 1080). Fairly new Samsung SSD (and some older platter HDs for storage). Motherboard, CPU, and ram are all from original build in 2011, however:
  • Motherboard: Gigabyte P67A-D3-B3
  • CPU: i5-2500k (I think--I honestly can't remember for sure, and I don't know how to find out now that the computer won't boot)
  • RAM: 4x 2GB GSkill stuff

Location: United States.

I have Googled and read the FAQ: Yes. I saw a variety of suggestions regarding PSU issues, but (as noted) swapping for a different one changed nothing. I'm not really sure where to go from here, but given the age of the mobo/CPU I'm okay deciding it's time to upgrade. I just want to be sure I'm not missing something obvious.

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Zogo
Jul 29, 2003



My first guess would be failing PSU but yours is only eight months old and the replacement made no difference either. Disconnect all SSDs/HDDs but if that doesn't help I bet the motherboard died.

The CPU and motherboard are a decade old so it could be the perfect excuse to get a new machine with TPM 2.0 capability.

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