X79 sabertooth only powers on after holding power button

K

kandor

Gawd
Joined
Aug 24, 2005
Messages
632
Hi,

I have a system with an X79 sabertooth mobo. Recently the power button stopped working, i.e it wouldn't turn on the system anymore, or intermittantly would turn it on.

I replaced the power switch but that wasn't the problem. So now, it's either the psu or the mobo (maybe mem stick?).

The only method that will turn on the system is to hold the power button down for about 15 to 20 sec. then let go and quickly tap it again. Then the system powers up and runs fine.

Although - I have noticed the boot_device led is staying lit.

Any ideas on this weird behaviour?

Thanks,
 
You say the power button stopped working, did you disconnect the cable to the board? Maybe a short in the microswitch ? But I would bet on memory or something maybe the cold boot it messing with your xmp profile on your sticks or something.
 
If that were me I'd try restoring the BIOS to defaults and/or reflashing it.
 
Hi,

It turned out to be intermittant PSU failure. It was a corsair 850, swapped with a newer corsair 860 and problems vanished instantly. I suppose it is possible it was a bad cable from the 850 but there is no way to prove it now.

Thanks!
 
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