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HT1939: Resetting PMU on Power Mac G5, Power Mac G4, Power Macintosh G3

Learn about Resetting PMU on Power Mac G5, Power Mac G4, Power Macintosh G3

HT1939 I re-set my PMU (dual 2.0 G5 Powermac) but still have issues.

542 Views 8 Replies Latest reply: Aug 27, 2012 4:13 PM by BDAqua RSS
Grant Lenahan Level 4 Level 4 (1,190 points)
Currently Being Moderated
Aug 22, 2012 9:33 AM

The symptoms are fans that always or often go to high when its not hot, and then the mac shuts down or becomes unresponsive.  When i got it ( fixing for a friend) it would power on but not boot up and the screen remained dark - often with the indicator light blinking.  Pressing the PMU seemed to help greatly, but symptoms have crept back....   Any pointers or ideas appreciated. 

 

Grant

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