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Author Topic: Powermac G4 Sawtooth shuts down after a second  (Read 917 times)

blazer1878

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  • Posts: 26
Powermac G4 Sawtooth shuts down after a second
« on: May 11, 2026, 09:15:40 AM »
For some reason this powermac turns off after a second. Firstly it started to freeze and kernel panic, then it gave up. I replaced psu 2 times using guide from atxg4.com, but it still does this. Nothing is connected apart from cpu and power, psu should be functional.
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68K: PowerBook 165c
PPC: Powermac G4 400mhz Sawtooth, Powermac G4 MDD 1.25 Single 2002, iBook G3 2002, iBook G4 m2005, Powermac G5 2003 dual
Intel: iMac 20 l2006, Apple TV 2007, MacBook Pro m2007, MacBook 13 e2008, MacBook Pro 15 l2008 Unibody, MacBook Air 13 2014, MacBook Air 11 2010
Apple Silicon: MacBook Air M2

blazer1878

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  • Posts: 26
Re: Powermac G4 Sawtooth shuts down after a second
« Reply #1 on: June 07, 2026, 03:23:19 PM »
Pls help as i don't want to gut this powermac to put board with laptop core duo cpu in it  >:(
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68K: PowerBook 165c
PPC: Powermac G4 400mhz Sawtooth, Powermac G4 MDD 1.25 Single 2002, iBook G3 2002, iBook G4 m2005, Powermac G5 2003 dual
Intel: iMac 20 l2006, Apple TV 2007, MacBook Pro m2007, MacBook 13 e2008, MacBook Pro 15 l2008 Unibody, MacBook Air 13 2014, MacBook Air 11 2010
Apple Silicon: MacBook Air M2

ovalking

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Re: Powermac G4 Sawtooth shuts down after a second
« Reply #2 on: June 08, 2026, 05:16:06 AM »
Is the power button working ok? e.g. sometimes they stick and don't retract properly.
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blazer1878

  • 16 MB
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  • Posts: 26
Re: Powermac G4 Sawtooth shuts down after a second
« Reply #3 on: June 08, 2026, 02:07:21 PM »
It does, i don't think that it's issue with powerbutton, as it is constant
Logged
68K: PowerBook 165c
PPC: Powermac G4 400mhz Sawtooth, Powermac G4 MDD 1.25 Single 2002, iBook G3 2002, iBook G4 m2005, Powermac G5 2003 dual
Intel: iMac 20 l2006, Apple TV 2007, MacBook Pro m2007, MacBook 13 e2008, MacBook Pro 15 l2008 Unibody, MacBook Air 13 2014, MacBook Air 11 2010
Apple Silicon: MacBook Air M2

smilesdavis

  • 1024 MB
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  • Posts: 1227
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Re: Powermac G4 Sawtooth shuts down after a second
« Reply #4 on: Today at 01:23:58 AM »
Sounds like hardware degradation

* CPU daughtercard
* CPU VRM / voltage regulation -> vheck caps corrosion burnt mosfets
* Logic board fault byebye
* Reseat CPU card
* PMU reset (once)
* do a Minimal config test
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Apple //c+; Gestalt 5 / 6 / 7 / 9 / 11 / 13 / 17 / 18 / 19 / 21 / 23 / 25 / 26 / 30 / 33 / 37 / 40 / 47 / 54 / 55 / 56 / 65 / 67 / 69 / 89 / 112 / 514; PowerMac1,1 / 1,2 / 2,1 / 2,2 / 3,1 / 3,3 / 3,4 / 3,5 / 3,6 / 4,1 / 4,2 / 4,4 / 4,5 / 5,1 / 6,1 / 6,3 / 6,4 / 7,2 / 7,3 / 8,1 / 8,2 / 9,1 / 10,1 / 10,2 / 11,2 / 12,1; Intel; ARM
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