|Has a disk been left in the drive?|
Did you try holding down the ALT Key and repeatedly hitting f10 key?
You asked why the HDD is faulty. If that is the case (likely) then, like most things, it probably just died of old age.
If you have recovery media put it in the drive then power your computer off then on again. Can you get into BIOS (this might be necessary to put the disk drive ahead of the HDD)? See this discussion about entering BIOS:
Always pop back and let us know the outcome - thanks
message edited by Derek