MacBook Pro doesn't see hard drive

My MacBook Pro doesn't see it's hard drive. It doesn't show up when I press the Option key or in Disk Utility on the Snow Leopard disc. It was working for a while and then the computer started freezing, mainly when I was using Xcode. I thought it was an OS problem originally. Then it would occasionally not see the hard drive and come up with the "?" folder. It steadily got worse until it reached where I am now, not working at all. It doesn't see my Windows XP partition either. I have reset the PRAM and NVRAM, but to no avail. The OS boots just fine when I put the hard drive in a different MacBook, so it's not the hard drive. I have taken great care of this computer, rarely taking it out of the house. I did buy it used with a backlight problem though, so I don't know exactly what the previous owner did. Any tips or suggestions would be greatly appreciated! Thanks!

Boot from your install disc & run Repair Disk from the utility menu. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
Select your language.
Once on the desktop, select Utility in the menu bar.
Select Disk Utility.
Select the disk or volume in the list of disks and volumes, and then click First Aid.
Click Repair Disk.
Restart your computer when done.
Repair permissions after you reach the desktop-http://docs.info.apple.com/article.html?artnum=25751
Or if you have Diskwarrior or Techtool Pro use one of these utilities by booting directly from their cd.

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