I have just finished building pc... Gigabyte MA785GMT-UD2H AMD Athlon II X4 620 4GB (2GBx2), 240-pin DIMM, DDR3 PC3-10600 memory 160GB WD1600AAJS ... and when I try to install xp operating system the drivers start to load for a few minutes (as normal) then blue STOP screen is displayed with following blue screen STOP message... A problem has been detected and Windows has been shut down to prevent damage to your computer. If this is the first time you've seen this Stop error screen, restart your computer. If this screen appears again, follow these steps: Check for viruses on your computer. Remove any newly installed hard drives or hard drive controllers. Check your hard drive to make sure it is properly configures and terminated. Run CHKDSK /F to check for hard drive corruption, and then restart your computer. Technical information: *** STOP: 0X0000007B (0XF78E2524, 0xC0000034, 0x00000000, 0x00000000) ................... end of blue screen message .......................... I don't think BIOS is recognising the sata drive correctly, can you advise? I have tried another HDD but still same problem, also tried another OS but problem is still there. ...when trying to boot for first time there was a SATA Mode message... "SATA is found running at IDE MODE" ... can't remember if I entered Y or N to this, so not sure if this has anything to do with the problem. Nothing I do in BIOS seems to help, is this a known problem? can I restore BIOS to factory settings as this motherboard supports DualBIOS, it has two BIOS onboard, a main BIOS and a backup BIOS, but how do I do this? ... any help would be appreciated.