MacBook drive doesn't mount, can I just replace it?

Hi,
I'm responsible for admin-ing a small Mac network here at a start up business, and I've had a problem with one of our user's MacBooks.
The machine booted to the Grey Question Mark Screen, which obviously wasn't good. I've done the PRAM, and attempted a reboot, with the same problem. The machine will load the Leopard Installer DVD, but will not install as it can't find the disk, same goes for Single User mode, which doesn't mount the drive.
My question is simply:
Am I correct in assuming swapping in a new drive will make the machine function fully? Can I assume the logic board works fine as it boots/loads other bits and pieces?
Any help would be great!
Many thanks,
Oli

Am I correct in assuming swapping in a new drive will make the machine function fully?
Maybe. It's most probably that it's the drive that's failed, but it's by no means the only possibility.
Can I assume the logic board works fine as it boots/loads other bits and pieces?
Not really, no. It's possible that the SATA interface on the logic board has failed. That would still allow the system to boot from a DVD, but keep it from accessing the hard drive.
If it were me, I would assume first that it was the drive that had failed, but I'd suggest either calling Apple tech support (presuming that the system is still under warranty) and getting their opinion, or taking the unit to an Apple Store or authorized service center. Then if the drive isn't the problem after all, you're not on the hook for a drive that you didn't need. Of course if it's out of warranty, then it's your call as to what to try. Perhaps you could find a friendly service center that could pop a drive into the system just to test and confirm that the problem is indeed the drive, before making you buy a replacement.

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