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#11
I would guess that either the motherboard or CPU is bad.
Diagnostic Test
CPU TEST
Run Prime95 to stress test your CPU. Prime95 - Stress Test Your CPU - Windows 7 Forums
WarningYour CPU temperatures will rise quickly while under this stress test. Keep a keen eye on them and abort the test if overheating occurs.
Make a photo of the result and post it.
I let it run for about 2.5 hours on the default test- no errors reported.
I did notice that the HDD light stops flashing once PC goes offline - never while in use. Sometimes when I turn on the monitor after hours on non-use, it's like a frozen screen shot. Can't type and completely non-responsive.
In the power plan, I noticed it's set to idle HDD after 20min, so I changed it to never. It seems like it may be going into an idle state, but never spinning back up properly.
Stress test results are attached.