PC Problem ( techs needed big time) Options

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OK, here is the problem. My mother shut her PC (2ghz celeron EMachine; WinXP) down 4 days ago, and like usual left it to shut off. Well when she came back it didnt shut down. It was just sitting there with the keyboard,mouse,and tower light flashing all syncranized(sp?). So we switched out the power supply since the fan wouldnt turn on it. Nope, that wasn't the problem. So we then decided to take the hard drive and connect it to 2 other PC's we had sitting around the house.

One of them is a 733Mhz Hewlett Packard. When we connect it it says a disk error. Then we tried the other PC. Which is slower then a 1.3 but faster than the HP. We connected it and it got to the point of loading up to safe mode, but then it just sits there along with all the other modes.

So any ideas of what might be wrong? And Do you think the hard drive crapped the bed?

[DaMnItLeWiS]

Also, when you get the the option to boot into safe mode does it even attempt to load into safe mode if you select it?

Normally when booting into safe mode you'll see all the files its attempting to load....whichever file it stops on usually means its corrupted.

There also should have been more to your error other than 'Disk Error' if you can supply the whole error it might help.