Thanks for the tip.
I actually did do that. Funny though, when I run it with the case open the fans kick into high gear. Still "burns" after about 20 minutes however.
Time to go to the shop I guess.
I have a dual 2 gig G5. I can run it for about 20 minutes, then it's starts to smell like something is burning. The screen fuzzes out and it shuts down. Power supply maybe? It runs fine up until the point where this burn and fuzz kicks in.