|Yes it probably is. But first open the case and make sure the hard drive data cable is in good condition and tightly attached on both ends.|
Does the hard drive show on the posting screen when you first turn it on?
If you have a floppy drive and it precedes the hard drive in the boot order, could it be something as simple as having left a non-booting floppy disk in the drive?
If the above doesn't help and by default the drive is bad then you need another one. If it's relatively new go to the hard drive manufacturer's site and see if it's still under warranty.
Otherwise just buy a new one. You may be able to get a higher capacity drive than you have now, and maybe for cheaper than an exact replacement. You'll need to check what you have now and then see what is available for your PC model or motherboard. Once you get the drive you'll need to physically attach it. Then boot up with the OS installation disk and reinstall the OS. If you have restore disks they should work too.
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