Non-repeatable BSOD with two different HDDs, mulitiple codes

I haven't had a chance to do the clean install yet, too much going on. When I do get a chance to do a clean install, I'll update this thread. Thanks for the help so far!

You're welcome. Thanks for keeping us posted. :)

Clean install from a brand new installation disc... and it's still having problems. And again, if I just leave it running 24/7, it works great. It's been running 24 hours a day (sleep mode disabled) for the last week, and blue screens. But if I were to shut it down every night, it'd probably start acting up again..

So now what?

Edit to add: just ran sfc /scannow, and it didn't come up with any errors.

Cold boot problems usually indicate memory, motherboard, PSU, or CPU errors (in that order). Did you run Memtest86+ to diagnose memory errors?