I'm at wits end with my computer. It's a custom built rig with the following: Windows XP w/ Media Center 2005 ASUS A8N-SLI Deluxe Mobo AMD 64x 4800 dual core processor 2 80 gig raptor hard drives in RAID 1 Corsair XPERT TWINXP 1024-3200XL RAM 2x512 MB 800 Watt PC Power and Cooling PSU Haupauge dual video tuner Sound Blaster Audigy 2ZS Approximately 2 months ago it started crashing, giving me the very helpful "IRQL_NOT_LESS_OR_EQUAL" error. Various stop numbers are 0x0000000D; 0x000004CO; 0x00000002; 0x00000000; and 0x80510CC8. Nearly two weeks ago the computer wouldn't boot, and would not recognize the hard drives. I made the mistake of taking it to Best Buy, where the Geek Squad took 10 days and simply reformatted the drives, wiping out all my data and software. Not a big problem, since I have everything backed up, but they should have asked first. I picked the computer up yesterday and began re-installing everything. Then today I walked in and get the "IRQL_NOT_LESS_OR_EQUAL" error once again. I've just about had it. Unless someone can suggest something, I'm planning on parting this computer out on eBay and going back to a stripped down Dell. Any thoughts would be greatly appreciated. I'm in the Sacramento area, so if anyone knows of any shops here that would help as well.