Computer Fans Speed Up After Startup Chime.


I have a powermac g4 (mirrored drive doors) and when i start up my mac the fans rev up after the startup chime. They stay at this accelerated speed until the "welcome to mac os x" screen comes up, then they go back to regular speed.

This has happened to me before and I brought it to the genius bar. They reset something, I think it was from single user mode.

At this point its an annoyance, but if it happened like last time, it will get worse until my computer no longer starts up.

Please help me out. Thanks.