Has anyone ever seen this error? I was testing a HD on another computer, by hooking it up to mine to see if the Bios could pick it up, and after that when I disconnected the drive I was testing, and went to restart my computer, I go a black screen with FreeDOS FAT Kernel as the error message. I don't know if the HD I was testing did something or not, any help?

The BIOS is the only thing that can remember settings in that situation. Reset your BIOS to defaults and hope no damage has been done to your hard drive. P.S. double check that you've not left boot floppy/CD in the drive from when you were testing the old drive.

Very Interesting, this happened when I formatted a USB Pen Drive and made it bootable. When I tried to Boot from the USB Pen ( as my Bios Supports Booting to USB HDDs ) I got the same error message "FreeDOS FAT Kernel" and thats it. It wont proceed. Did the same on a DELL Latitude D600 and the Machine was able to boot from the Pen Drive with no issues. So what I would conclude here is that although the Bios is trying to boot from your HDD it is unable to do so. I am sure you hard disc is fine. Try updating your Bios and see how it goes.