I had Windows on this comp a while back. But I got it rid of it for some stupid reason. Now I have Ubuntu and just want to scrap it. Here's the deal, both of my drives still think there's a windows partition when there's not. I can't boot from cd or usb or floppy. can only boot to currently installed OSs. I've tried replacing GRUB with MSDOS but it hasn't been working. I've done the dd command where it erases all data including partitions on the drive. All this and still can't get to booting another OS. Even one that erases everything on the drives like DBAN. Any help will be very much appreciated. (I'm trying to replace Ubuntu with WIndows XP Pro) edit: I've gone into the dang bios and done all I can with the boot order, hard drive activity, memory checks, etc... So stop saying go to bios! More clearly stated: after changing the boot order to have CD-ROM device boot first, and after inserting the Ubuntu 8.10 LIVE CD, and after saving changes and whatnot, it reboots and shows the loading screen where it's turning on the computer itself, not the OS, you know the screen where it shows Press this key for setup and that key for options, at that screen, after having done previously stated stuff, I hit F12 (the options key) and it goes to this menu with 12 or so options, the 6th being the one stating "6. IDE CD-ROM DEVICE", I select that as being the one to boot from. Right once I click that, it gives this error message saying that I CANNOT boot from that device as it is not a bootable devicer and says for me to insert a floppy disk to continue or press any other key to go to continue. (I currently possess no floppy disks so I just hit a key) when I hit a key it says "Loading GRUB Stage 1.5... GRUB Loading please wait..." and it does that in a couple seconds. Also, I DO NOT HAVE WINDOWS ON THIS COMP! The drive just picks up a Windows Partion and at the bottom says: "Other Operating Systems: Windows XP Professional" to boot from. When I click it, it says "Loading GRUB 2.0... Loading please wait" and all it does is flash that message for like 2seconds and then takes me back to the OS selection screen.