Having trouble booting and general usage

So I've got an intel iMac running Windows 7 Professional and 10.6 The computer will randomly stop working while I'm using either OS, just kind of freeze for a few seconds to minutes and then all of a sudden will act responsive again. So I tried reinstalling both OS' and still having trouble. Before and after the reinstalls the boot menu (holding alt) will show no drives, but will show a bootable cd if I have one in there.
I work in IT for a relatively large campus and I've seen my fair share of viruses and the like, and I don't think the problem is in software. Could there be an issue with the EFI firmware reading the disks? This doesn't seem likely as the OS X install disk will sometimes show the Hard drive in disk utility, and other times not. I'm thinking its either a loose cable, or a dying hard drive. Thoughts?

If you want to check the HD you can run Apple Hardware Test in extended mode. You can find out how at: http://support.apple.com/kb/HT1509 If the system finds some errors please reproduce the error codes here.

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