Power up problems

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gdmaclew

gdmaclew

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May 20, 2008
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My 4 year-old AMD mid-tower computer has developed a strange problem over the last 3 days. It is normally on 24/7. I accidently shut it down 3 days ago when I was attempting to boot into Win10 from Win 7. I pushed the power button to start it again and nothing happened. I opened the case and it was quite dusty. So I vacuumed it out, reseated the memory DIMMs, checked all the wires going to the motherboard including the power switch wires. I pushed the power button and again nothing happened.
I turned off the PSU switch and turned it back on and tried the power switch again and for a split second it looked like it was going to power up. The green light was lit on the MB and the CPU fan turned for an instant and then stopped.
I turned off the PSU switch and went away for an hour and came back, turned on the PSU switch and pushed the power button and it powered up like normal.

Today it happened again. I accidently powered it off and it would not power on immediately. I went thru the above procedure and waited an hour and it powered on normally.
I am stumped.
I don't know whether it's MB, PSU or CPU.
It is not overheating and runs in the low 30's at idle and mid 30's at moderate load.
Any thoughts?
 
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gdmaclew

gdmaclew

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May 20, 2008
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Thank you.
As I mentioned in my first posting, I re-seated the memory after the first occurance. I'll just hazard a guess but whatever component on the motherboard is sensing the voltage is somehow overheating and will not allow the MB to power up until it "cools down" or somehow resets itself?
I know that sensing the correct voltage is part of the boot-up process and if it's off by even a little bit, it won't start. Correct?

OR...

could something in the PSU be "overheating"and sending the wrong voltage to the MB and it needs to cool down before allowing a reboot but allows the computer to run for days or weeks without any problems?

The PSU is a SilverStone Strider Gold S Series 750 unit and it is 1 year old.
I have a new spare Corsair RM 750 PSU that I could install. I wanted to try and narrow this down before I did the exchange.

 
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gdmaclew

gdmaclew

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May 20, 2008
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Turns out it was the PSU. My computer shut down yesterday morning all by itself.
I powered off the PSU for 2 hours and tried to start it up - no dice.
Then I left it switched off overnight, switched it on and tried to power up the computer. Still nothing.
So I proceeded to change out the PSU (Silverstone Strider Gold 750W). I replaced it with my brand new spare Corsair RM750.
It started up with now problems and I can power it off and start it up immediately with any problems. The Silverstone is 2 and a half years old but I didn't put it in my computer until March of last year when my original PC Power&Cooling PSU failed. So the Silverstone was only in service for 14 months before it failed. I am requesting a warranty replacement.

Thanks for all your suggestions.
 
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