I’ve been having a weird issue with the motherboard on my pc. The first time you boot it in a day, it was very likely to freeze on you – either after the USB started flopping on and off, or the sound starting cracking, and so on… not very fun. Solution: power off the power supply for a minute, power it back on, and it would be good to go for the rest of the day. It’s not an unknown issue (see this thread on the Abit forums)
The weird thing is, this problem only started after switching cases due to noise. No idea why, the power supply is actually more stable than the previous one!
I recently related this to some coworkers, and one of them still had a spare motherboard around… so I recently replaced my Abit KN9-SLI mainboard with an Asus M2N-SLI Deluxe mainboard, and have had no problems since. I finally have a stable pc again! :)