My friend's having a problem overclocking his E8400.
Core 2 Duo E8400
2GB Corsair DDR2-800 RAM
3 Hard drives
3LED case fans
The problem is, he can get up to FSB400 on stock volts fine, but he can't get it to go any further. FSB401 and it wouldn't even POST. His hard drives won't powre up at all. His PSU should be fine with this, because he pulled out the 8800GT and it still wouldn't POST at FSB401. He looked at his RAM frequency and timing and it shouldn't be causing problems. He's increased the voltage to 1.3V and it still wouldn't boot at anything more than FSB400.
What can be causing the problem? He says his HDDs won't even spin up when he sets it beyong FSB400. Could this be a motherboard issue?
Yep, it's the g31. e8400 use 9x multiplier, so that's 9x400=3.6ghz, for 1600mhz fsb. The g31 chipset runs at 1066mhz natively, some manufacturers cite higher fsb for their board, but 1600mhz is just too far off. It's strange for it to even be able to reach 1600mhz fsb at all. Did your friend even stress with prime95? If it doesn't post at 1mhz over 1600, it's likely not stable.
You might think of a little more voltage to the NB. I have a Rampage Formula and I left the NB on auto when I first overclocked my E8400 and the board seriously overvolted the NB so it might be a situation like that as well. It also might be a problem of the NB overheating.