I have run into an interesting problem. Afetr I put an SiS 315 card into my XP box, I noticed during the boot sequence that the display adapter did not have an IRQ assigned. It actually said "NA". This is interesting because immediately afterwards, the machine failed to boot. The machine would not boot into "Safe Mode" either. Moreover, the same thing happened on my Win98 box, except that after a few seconds after the BIOS screen, the machine successfully booted, in spite of the display adapter also having "NA" for its IRQ. Nevertheless, it booted while XP did not. Now, when I put my original video card back in the XP box, everything works OK. Clearly, something in my XP machine in combination with the SiS 315 is preventing the system from booting. Or it could be something within my system altogether. Any help and/or suggestions will be greatly appreciated. Thanks.