Recently my PC had been rebooting randomly (instantly powering off and starting back up). After a few days of this, today when it did that I rebooted in safe mode and started a scan with ad-aware and a few minutes later it powered down. When it powered back on, it had a CMOS checksum error - defaults loaded, followed by something about "if operations system on SATA drive check boot order." I hit F1 to continue and it got to the "verifying DMI data pool" screen and just hangs there indefinitely everytime I boot up. edit: the exact error is: "CMOS checksum error - Defaults loaded If your Operation system has install on SATA HDD already. Please check SATA access mode and Hard Disk Boot Priority" I did recently disconnect my floppy drive, but that was a couple weeks ago and it has been booted up many times without issues since then. I tried entering my BIOS and making sure everything was OK, and also resetting all to default. I also removed the CMOS battery for several minutes (with power cable unplugged) and then put it back in, but that didn't change anything. I plan on replacing the battery tomorrow, but I doubt that is the problem because the computer is only a couple years old and never had problems keeping time or what not. One thing to note is I only get the CMOS error after I enter the BIOS or when I removed the CMOS battery, other times there is no error but it still hangs at "verifying DMI data pool" indefinitely. I have a Gak8n motherboard, x1900xt graphics card, run windows xp service pack 2 all updated, 2 sata drives in a RAID and another not, 2x512mb sticks of ram and 2x1gb, updated my BIOS about a month ago. I have made no recent hardware/software changes. Thanks for any ideas this is driving me crazy.