I hate to say it, but your hd might be shot. Do you know if it had the stock IBM deskstar drive? These are known to go on you especially if they're left on for extended periods of time & the drive was never put on the "no spin" feature (they were sh!t drives from the start anyway).
Maybe try opening the unit and reseating the hd's connections, ie: the ide & power cables. If still no luck, look forward to replacing it.
But it sounds like you're good to go on that backup. Once you've installed your new drive, you can use ak.sys to ease the copying of your files if you choose to do so.
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