G5 1.8 GHz Dual-- Fan Always on High Speed

Question

I had my logic board replaced (by an apple certified repair place) and now the fan is always on super high. It goes on high speed at start-up and only stops when I shut down or put it to sleep. Before I had to repace the logic board it was a very quiet computer. I live on an island and I have already had to ship it to the repair place twice and was without my computer for 5 weeks. Is there any way to get the fan to run at a normal speed without sending it back to the repair place. Something I can do myself.
ps. I'm not doing any intensive computing just word processing, surfing the web and midi input. I use Filemaker, Finale, Appleworks, Safari and Excel.
G5 1.8 ghz dual   Mac OS X (10.3.9)  
G5 1.8 ghz dual   Mac OS X (10.3.9)  
G5 1.8 ghz dual   Mac OS X (10.3.9)  

Answer 1

Hi bphughes, and a Warm Welcome to Apple Discussions and the Power Mac G5 Forum!
You could try a PMU/SMU reset
http://docs.info.apple.com/article.html?artnum=300341
Use the second procedure if you have a button as shown in the diagram - use the first method if you don't. You may not have to remove the intake fan assembly to get at the button. Observe static precautions and make sure to press the button once only.
If the roaring fan is constant from startup to shutdown - Is there a red light on inside the G5 when the fans are hyper? Probably visible from the outside through the front grille - it will be clearly visible, to the left of the RAM slots, on the edge of the main logic board, if you take off the aluminium side panel.
If so, the clear plastic deflector panel may not be located correctly in its slots.
Please post again if nothing helps - or if you have further details.