Last night it crashed, and there was no fire going or heater.

It crashed a few minutes ago when I was burning a DVD.

In fact, it always crashes when I try to burn a DVD now. I've wasted quite a few DVD-Rs...

The only thing I see in the event viewer from around the time it crashed while burning is:

Event Type: Error
Event Source: Removable Storage Service
Event Category: None
Event ID: 116
Date: 10/28/2004
Time: 2:56:38 PM
User: N/A
Computer: COMP2
Description:
RSM could not identify the media in drive Drive 0 of library _NEC DVD_RW ND-2510A. An error was encountered while attempting to read data from the media.
Data:
0000: 01 00 00 00 ....