What happened exactly? Did the heat sink come off or lifted up?
A common Athlon processor failure is caused by the heat sink
coming off or accidently cracking the processor die while clipping
on the heat sink.
The problem is more common with Athlon T-Birds.
Chiefly if it was an Athlon T-Bird, if the heat sink comes unclipped,
the processor will fry within 10 seconds and you are likely
to literally see smoke and possibly a fire, because if and when
the heat sink comes off, the processor temperature can climb
up to 750 F!!!