Hi folks, I'm new here. I have a big problem with my HD/Motherboard. The motherboard went in my "A" computer. Since I have a spare computer I decided to put the ("B" computer's) motherboard, processor etc into the case of computer "A." and use the same drive setup etc. I left the drives, harddisk & jumpers etc where they were in "A." now I've connected it all up and when I start it up It will not boot from the hard disk and gives a "DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER" message. Now the weird thing is, I have booted from the xp disk and when I try to set up windows the setup screen tells me that I have "694097 MB of unpartitioned space" but has no record of the previous windows installation! I know that it is still on there as the HD hasn't been formatted, just connected to a different MB. Also shouldn't that number be one figure less seeing as its an 80Gig HD? I cannot get past this screen now. When I press enter to install it simply doesnt do anything, and when I press c to create a new partition that wont work either. I have no idea what to try next. Any ideas guys? Some info: The harddisk is on IDE channel 0 and is detected in auto-detection in the BIOS (Capacity 81GB, Cylinder 39236, Head 16, Precomp 0, Landing Zone 39235, Sector 255) I have a slave dvd writer on channel 0 as well and a CD writer and DVD ROM on channel 1 I did clear the CMOS (took battery out) before booting the new system. The motherboard is a Gigabyte GA-8I848P-G P4 the hard disk was previously in a ASROCK AMD Athlon XP 3200 setup Cheers. PS I would like to try and boot the old XP install since I have not backup up my data, however if thats not possible I just want my PC to boot even if it means erasing it!