Hello, I have a Toshiba Satellite C650 and put a used hard disk in it with Windows 7 pre-installed in it. Now when I try to format it and reinstall Windows 7 fresh in it, it doesn't boot from the DVD rom and goes straight in windows 7. I tried booting from F12 still same problem. I also tried using an external DVD rom still same problem. I can boot into BIOS. Can anyone help me out?