Question start / stop problem

Apr 21, 2020
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I know, I know... this question has been answered before, and I've done the research before posting... but.. there's an interesting twist... my CPU is approaching 7 years old... Antec 650 PS, i7-4790K, 16GB RAM, eight fans... this machine has worked fine until one day, I hit the power button to hear it rev up and stop, rev up and stop... I'd had some audio problems that I thought was the audio interface (Focusrite Scarlett 18i20), but now I'm sure it's the motherboard... so I thought. The next day the CPU worked fine. The next day, rev up and stop. It worked again for a couple of days and then the same trouble.

Thinking it was a short, I disassembled it entirely, reseated everything - memory, connectors, cards... still rev and stop. Could it still be the motherboard, or something else? Should I forget about it and upgrade?
 
Apr 21, 2020
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That Antec 650 PSU is 7 years old too? Probably the PSU.
I took a closer look, and the power supply is acting like the rest of the unit (start, stop, start, stop). That should be a clear indicator that the problem starts with the PS. Thank you again. I am grateful for your reply and suggestion, and the best place to start on fixing the problem.
 
Apr 21, 2020
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Just for the record: I replaced the PSU with an equivalent. It still starts/stops. I will replace the MB as soon as funds allow and see what happens.
 

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