Upgraded to an AMD 3500+ and Asus A8N SLI MB. 1 Gig memory DDR 400 memory. Hard drives used is (1) 160G WD SATA drive, and (1) 40G. $0 g has the bootup blocks. Upgraded 520W power supply and installed ASUS N6600 SLI ready graphics card. System attempts to boot normally but crashes at the point where the Windows XP logo startup screen should come in. It does not get any further. I tried all the Win XP options safe boot, last good config etc. Help!!!