Never had an os on this machine. Old wiped hard drives. I tried putting a hard drive on it with Windows 7 working, one I had done off another system. However as soon as It starts up, it stops on the word "windows", again. Could it be that the motherboard is at fault, or maybe the way its trying to write on the HDD (gives basic options of IDE, RAID, AHCI but it is connected with a sata cable to the board (No ATA)).