Go into the start up options, click "F8" or "F12" but this varies from computer to computer.
After that it should list all hard drives in your computer.
Select the one too boot from and see if it boots.
Go into the start up options, click "F8" or "F12" but this varies from computer to computer.
After that it should list all hard drives in your computer.
Select the one too boot from and see if it boots.