Hello, I purchased a new hard drive recently for a Friends netbook since the HDD in it died. So I got the new HDD, installed a copy of Windows 7 32 bit onto the hard drive (from a different computer) and it worked well. Now when I put in the HDD to the netbook, the motherboard screen shows, but when windows 7 starts loading after about three seconds the computer crashes and restarts. So, I try to use an external optical drive to see if I can format the drive, but the netbook says "No operating system found", (it does not mean on the HDD, it is talking about the optical drive) so I then use my pen drive with a copy of windows 7 on it and it just says "disk error". This is such a bizzar problem. Maybe the motherboard is damaged? I really don't know.