My PC specification a few weeks ago:
DFI Lanparty 875P motherboard
Intel Pentium 4 Northwood - 3Ghz
Saphire Radeon X800 Pro
Creative Soundblaster Audigy 2
2 x Seagate 160Gb SATA hard drives
Antec TrueBlue 480W PSU
I recently added a pair of Seagate 250Gb hard drives and a Highpoint RAID controller card. I also moved the whole system into a new case but I doubt that’s relevant. Since then the monitor has sometimes went blank and I’ve been getting errors reporting that two many devices are plugged into the same USB bus. I unplugged the two new hard drives and the monitor problem doesn’t seem to happen any more.
EDIT: Also there were four 80mm fans in the old setup, since switching to the new case there are now two 120mm fans and three 80mm fans.