Have new mobo (AM2+, DDR2), CPU (AM2+), RAM (DDR2, 1GB x 2), 450W PS and HDD (WD 250GB SATA). Installed XP (and all drivers) and PC worked for 7 hrs yesterday. Booted PC today and got blue screen, said there were errors. Can't get into Safe Mode (blue screen) and tried repairing XP with XP CD - it loaded files then got blue screen. Loaded Fail Safe Defaults in BIOS and cleared CMOS with no change. Forgot how to use CHKDSK - did it last week on another hard drive - thought it was on XP CD or in Safe Mode w/Command Prmpt but can't find it. Can another component like mobo, CPU, RAM besides the HDD cause blue screen? BIOS parameter prevent Windows from loading? Don't know where to start.