Computer boots with overclock, runs fine overnight with stress test, won't POST on second restart

Operating System: Windows 8 build 9200 (64-bit)
CPU Type: AMD Phenom II X4 955
Motherboard: A885GM-A2
Memory: 8GB G Skill Intl DDR3 SDRAM
Videocard: NVIDIA GeForce GTS 450
Hard Drive: TOSHIBA DT01ACA100 SATA Disk Device (1TB)
Hard Drive: OCZ-VERT EX3 SATA Disk Device (120GB)
Hard Drive: Hitachi HTS545050B9A300 (500GB)
Cooling: Stock CPU cooler, 5 x 80mm fans, 1 x 120mm fan

I'm attempting to overclock from 3.2 to 4.0. Initially I tried at 1.55 Vcore (highest possible) to see if it would turn on at all. It ran overnight between 68-70 Celsius under Prime95, which is fairly hot but as far as I understand not exactly a meltdown temperature. When I restarted the computer though, it wouldn't POST, and I had to reset the BIOS and start over. I'm fairly new to overclocking, so I thought that no POST means it's not a stable configuration, but for it to start once and then not start the second time seems illogical to me.

I decided to go to 3.8 GHz and I've been stress testing from 1.55 Vcore to (currently) 1.45 V, running at 59 celcius overnight on Prime95.

Hitting 4.0 is not really a necessity, as I'm just doing this for the experience of overclocking (and it's fun for some reason). But at the very least I'd like to understand if there is a reason for such odd behavior.

Thanks for any assistance in advance.
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More about computer boots overclock runs fine overnight stress test post restart
  1. It is likely a power delivery issue. You will not hit 4.0 because of the motherboard's poor VRM design (3+1). It is designed for everyday use, not overclocking.
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