"Pop" - and then it sort of dies

Hi - I was running my ibook G4 today when it suddenly died. It's about 2.5 years old, and has never presented any problems. On this occasion, I had only been using it for about 2 hours or so. I was running Quicktime and Firefox with an external hard disk plugged in when there was a 'pop' sound, and the whole thing died. There does not seem to be any power coursing through as the hard disk was not lit, and attempts to re-start the ibook have failed - no sound, no fan, nothing.
Is the ibook (shudder) dead? The external power chord is still lighting up; I've tried letting it cool down for a bit and re-starting, to no avail. Any ideas, anyone? Help?
Thanks!

Is this drive bus powered or does it have its own AC power adapter? If bus powered you most likely need a powered hub.

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