Before Format/Reinstall you might want to try this:
Make sure your HD is being picked up correctly in the Bios:
if everything in Bios is good,boot with a startup disk in Drive A:,and do the command "sys C:" without the "".
If that don't do the trick,Boot form Floppy disk again and check out to make sure that your HD is set to Active partition in fdisk.
type "Fdisk" without "" to get into Fdisk utility.
if drive is set to active,and all above has been checked,it could just be your cable.change cables then try again.
other then that,it could be a boot Virus,or you may need to Format and Reinstall.
Good Luck.
[Edit]Info above is only for the Win9x OS.guessing thats what you was running in that HD 🙂 [/Edit]
Shawn.