What error msg u've got? "No Operating System Detected" / "Missing Operating System"?
Best guess, hard drive sector 0 error or so call MBR (Master boot record). If that's the case, too bad, u'll need a new hard drive.
"And liftoff, the final liftoff of Atlantis, shoulders of the space shuttle, America will continue the dream."
"Liftoff for the final launch of Endeavor. 'xpending our knowledge, 'xpending our lives in space."
"The final liftoff of Discovery, a tribute to the dedication, hard work and pride of America's space shuttle team."