My computer setup: P4 2.4GHz ATI Radeon Pro 9800 128mb 16x Sony DVD-rom 8x plextor DVD-r/rw 42x plextor cd-r 40GB hd - main hd 17GB hd - scsi hd, connected via Adaptec SCSI card 45GB hd 80GB hd The last two are setup via an onboard RAID controller called mbfasttrak or something to that effect. I believe my power supply is 430 watts. I don't turn my computer off very often and reboot as little as possible. In recent months, my computer has been experiencing problems with my backup drives. Before I swapped SCSI cards, I couldn't boot all four drives together when all my USB devices were plugged in (mouse, scanner, printer, extigy), so I had to unplug my USB devices and boot, and everything would be fine. But I got tired of that, so I decided to get a new SCSI card, hoping it would fix the problem. Well, it didn't. Now, I can't get them to boot together at all, it's either the SCSI drive or the other two. Also, after my computer is up for a while, the SCSI drive stops responding, like it opens up, but if I want to open any folders on it, it won't work, it'll say "This drive is inaccessible" or something, and I have to turn my PC off for several hours to get it to work again. Two things show up on boot, this thing called Adaptec SCSI Drive select (or something similar) and MBFasttrak lite 1.3 (or something similar). But after I swapped cards, all that comes up is the SCSI one, the other one doesn't show up at all, even if I disconnect my USB devices. Any help would be very appreciated, I'm sorry if I left anything out, and I sincerely hope I posted this in the right forum.