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Since this morning, my computer won't start. I was using it normally (playing) and it suddenly turned off. Now it won't start. Sometimes, when I press the power button, it starts for half a second to a second, and then turns back off. I noticed this happens more when I unplug the power chord and plug it back in.

I didn't change anything in the hardware, and I don't think it's a software issue since it doesn't stay on long enough for anything to boot.

I'm thinking it could be related to my power unit but I want to be sure before replacing it.

How do I diagnose and fix the problem?

I plugged my power chord on another computer and it worked (at least it stayed on). I also checked that everything is properly plugged in on the motherboard.

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    this set of answers has some good info and possibilities for what the problem might be. superuser.com/questions/361464/… At the least you need to put up all your specs for the computers parts. Disconnect every thing stuffed into ports on the outside, untill you at least get to posting. – Psycogeek Dec 6 '15 at 14:04
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It can be due to the power supply unit issue or a motherboard issue. Your computer goes to the protected mode due to the overcurrent. The easiest way to diagnose this - to connect another PSU to the motherboard. I advise to disconnect all peripheral devices file HDD, ODD, etc.

All the rest of the diagnostics required some electronics understanding and measurements of the input voltage on the motherboard.

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  • Failed power supply seems the most likely. – Zeiss Ikon Dec 11 '15 at 18:49
  • It was indeed. I diagnosed it using the paperclip test. – Kaidjin Dec 14 '15 at 13:49

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