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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

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Title			Views	Latest activity
My G5 Power Mac does not chime or power on my Apple Cinema display but fansspeed up until running at top speed and remain there. in Cinema Displays by Jesse_K	Show 1 Bookmarks1	1	44	July 6, 2016 2:06 PM by Jesse_K
I have an older G5 and the start up screen has gone to grey with the Apple logo and the fan is running at a very high speed. What is the fix? in Mac OS X v10.3 and earlier by Klaus1	Show 0 Bookmarks0	1	422	April 16, 2016 10:04 AM by Klaus1
iMac G3 Tray Loader stuck on grey screen with folder flashing question mark in iMac (PPC) by Dr Scrubbington	Show 0 Bookmarks0	13	428	February 21, 2016 3:42 PM by Dr Scrubbington
Power Mac G5 Blank screen and no chime on start up in Power Mac by BDAqua	Show 1 Bookmarks1	22	16191	January 4, 2016 1:09 PM by BDAqua
Powermac G5 won't start up in Power Mac by The Count	Show 1 Bookmarks1	13	10314	October 25, 2015 2:24 PM by The Count
Power Mac G5 continuously restarts on its own in Power Mac by omaldonado89	Show 0 Bookmarks0	5	414	October 22, 2015 12:09 PM by omaldonado89
How to reset PMU on powerbook G4a, 1.25 Ghz in PowerBook by ChitlinsCC	Show 0 Bookmarks0	9	741	September 22, 2015 2:30 PM by ChitlinsCC
Power mac g5 will not turn on in Power Mac by BDAqua	Show 0 Bookmarks0	15	1538	July 3, 2015 10:47 AM by BDAqua
Power Mac G5 2.0Ghz Boot Problem in Power Mac by BDAqua	Show 0 Bookmarks0	14	492	June 9, 2015 1:58 PM by BDAqua
can't find cuda/smu button on G5 tower in Power Mac by BDAqua	Show 0 Bookmarks0	1	887	May 24, 2015 3:03 PM by BDAqua
My powermac g4 starts up and shuts down immediately after. Why? in Power Mac by BDAqua	Show 0 Bookmarks0	21	1355	May 9, 2015 10:20 AM by BDAqua
G4 Quicksilver power light dimms asa I release power button in Power Mac by Dave Hamilton	Show 0 Bookmarks0	4	328	March 25, 2015 11:25 PM by Dave Hamilton
Cannot reach boot selector screen in Mac Pro by TomL100	Show 0 Bookmarks0	10	146	March 22, 2015 1:12 PM by TomL100
Powermac G5 won't chime or display. in Power Mac by BDAqua	Show 0 Bookmarks0	3	518	February 14, 2015 11:13 AM by BDAqua
Lost power up capability after two power dips in Power Mac by BDAqua	Show 0 Bookmarks0	1	180	February 3, 2015 11:57 AM by BDAqua
Quicksilver 2002 won't shut down. . Need help. in Power Mac by BDAqua	Show 1 Bookmarks1	17	366	January 13, 2015 5:15 PM by BDAqua
Power Mac G4 MDD strange startup problem in Power Mac by kahjot	Show 0 Bookmarks0	75	1955	December 16, 2014 8:10 AM by kahjot
Power Mac G4 not turning on after clean shutdown, works otherwise. in Power Mac by alfonsojon	Show 0 Bookmarks0	41	3176	December 11, 2014 8:57 PM by alfonsojon
"You need to restart your computer. Hold down the Power button for several seconds or press the Restart button." in Power Mac by BDAqua	Show 0 Bookmarks0	6	3578	October 15, 2014 10:37 AM by BDAqua
power mac g5 a1093 emc 2020 light stays on but wont start in Power Mac by Allan Jones	Show 0 Bookmarks0	2	451	August 25, 2014 8:48 PM by Allan Jones
g4 on-button not turning on computer in Power Mac by a brody	Show 0 Bookmarks0	11	388	August 19, 2014 3:43 AM by a brody
A1152 mouse "scroll ball" speed in Mac OS X v10.5 Leopard by Klaus1	Show 0 Bookmarks0	5	655	August 18, 2014 3:44 PM by Klaus1
Self-Assigned IP fix? in Power Mac by BDAqua	Show 0 Bookmarks0	3	13187	July 3, 2014 4:52 PM by BDAqua
PowerPC G5 1.6GHz not starting up..please help! in Power Mac by BDAqua	Show 0 Bookmarks0	46	5207	March 24, 2014 11:47 AM by BDAqua
iMac G5 won't boot, external interrupt error in iMac (PPC) by Klaus1	Show 0 Bookmarks0	3	418	February 25, 2014 3:35 PM by Klaus1
blackscreen upon startup/keyboard responsive g5 in Power Mac by BDAqua	Show 0 Bookmarks0	18	681	February 17, 2014 11:56 AM by BDAqua
G5 tiger has black screen won't boot high fan noise disks packed away in Power Mac by a brody	Show 0 Bookmarks0	16	1415	February 10, 2014 7:11 AM by a brody
Imac G4 20" Power, Display on but, hdd and DVD not detecting in iMac (PPC) by rccharles	Show 0 Bookmarks0	4	543	January 31, 2014 2:10 PM by rccharles
smc reset in Mac Pro by Grant Bennet-Alder	Show 0 Bookmarks0	3	347	January 28, 2014 10:37 AM by Grant Bennet-Alder
th button. This happened some months ago and I succeeded in starting it using a procedure I found on some forum, which involved pmu reset etc. now I cannot find this advice. If anyone remembers how this is done I would be gr in Power Mac by kaz-k	Show 0 Bookmarks0	1	270	January 28, 2014 7:45 AM by kaz-k

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