Hello, just looking for support troubleshooting my desktop randomly turning off.
Motherboard: ASUS P7H55-M Pro Intel H55 Socket LGA1156
Processor: Intel Core i5-750 2.66Ghz 8M LGA1156 CPU
Power Supply: DiabloTek PHD550 ATX Power Supply - 550W, 140mm Fan, 20+4 Pin
I have replaced the heat sync, because I was getting CPU Fan Alerts randomly when booting in the past, and I have left the PC open for the last few weeks for troubleshooting; all fans running properly, and not overheating. I used Real Temp to monitor the temps. Cleaned the processor of all the old thermal paste as well.
It's not the RAM: I have ran memtest, and also done process of elimination...still reboots randomly with all different variants of the RAM.
It's not the hard drive as I have installed Windows 7 fresh on two different hard drives now...same effects.
Windows 7 reports only half of the RAM I am using; it's 64 bit. I have 12gb RAM, and Windows will state 12GB (5.97 usable). Currently I have 8gb RAM installed (2 x 4gb) right next to each other and Windows only sees 4gb of the 8gb.
I am thinking it is motherboard related, but could it be power supply related? I used the Ultra power supply tester and the -5v (I believe) does not light up...but I have had this issues with majority of power supplies I have ever tested, and always shrugged it off. I tested the EPS+12v on the power supply too and it did NOT light anything up at all, but I believe it's a bit different of a plug. I did not test the two at the same time.
Also, there are no bulging capacitors or anything physical that looks damaged.
Unfortunately, this is a socket 1156 motherboard which are no longer manufactured and if it's the mobo only want to replace that instead of buying a new mobo/proc combo.
Thanks in advance!
Edited by mattbirk, 03 March 2015 - 10:14 PM.