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@JonoMarshall
Heh, this thread took a turn...
G4 and G5 hardware problems will be unrelated.
G5 iMacs were plagued by over-heating resistors that can cause all sorts of power and display related problems. To check if your G5 iMac has been affected just take the back off and check for any "bulged" resistors. If they're there then kick up a fuss and Apple may fix your machine for free. You'll need a full logic board replacement (costly).
Hobo, I can fix Macs, but I would void your warranty. You'll find that some pencil lead on the fan should clear it up. The Superdrive will likely need to be replaced, grab a cheap one off the bay.
To echo the comments above, a "burned out" or "fudged" machine will still hold your data unless the HD failed, there are loads of ways to go about this. The best one being to remove the HD and install it within an external enclosure.