I have Windows XP installed on a RAID 0 array through the Intel ICH5 chipset. Here what I found after updating to BIOS 21. I cleared CMOS and reset everything to the way I had it before. The system will not boot at all. Says invalid disk. I think "Oh no" so I reflash back to the working BIOS 18 I had before. Again set everthing correctly and cleared CMOS. This is how I tricked it into booting correctly. What I did when I see the "DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER" is insert Windows XP install CD (probably will work with any bootable CD). Now the computer says "Press any key to boot from CD....." So I DO NOT press anything, and bam, my install of Windows Loads fine off my RAIDed harddrives. So now when I reboot windows and I get to the part where it should boot. No go. Same "DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER" problem. I hope that I don't have to keep the Windows XP CD in all the time and trick it to boot like I described. Any suggestions? I really appeciate any input. Thanks in advance.