IMac PPC :: G5 Works Only When Cold Booted

May 21, 2012

I have first revision iMac G5 with 1.8GHz processor and 17" display, graphics adapter is NVIDIA FX 5200. Problem is that the machine seems to work only if cold booted, if I shut it down after succesful boot (after some use) and wait just little after powering it up again, it will display artifacts and/or lock up. When booted succesfully, I was able to play Halo for 20 minutes (after that I quitted) and run various benchmarks. When the machine is in "artifact mode" Apple Hardware Test says that GPU is the fault, but isn't it strange that I was able to play Halo for such a long time, 3D games are the ones which should tax the GPU and reveal flaws? Also when cold booted to AHT everything passes. 

I know that this model suffers from bad caps and I have already replaced some of them, not all, but with no difference. I cannot look inside the power supply properly because there are security screws which require their own type of screwdriver.

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Mar 26, 2012

I am running the 27" iMac with dual hard drives and have recently upgraded to Lion. Two things are happening.

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2. On cold start / boot up, sometimes I receive a pop up telling me that TestGen is not installed properly and to please re-start. Of course, since I have no sound I'm automatically doing that.

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Info:
iMac (27-inch Mid 2010), Mac OS X (10.7.3)

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Sep 10, 2014

Mac Pro

Early 2008

Model Identifier: MacPro3,1

Processor  2 x 2.8 GHz Quad-Core Intel Xeon

Memory  16 GB 667 MHz DDR2 FB-DIMM

Graphics  ATI Radeon HD 2600 XT 256 MB

Software  OS X 10.9.4 (13E28)

Boot ROM Version: MP31.006C.B05

SMC Version (system): 1.25f4

This is the first time I've encountered this. Upon cold booting the machine it went directly to the legacy Mac OS X Server login screen from before the upgrade to Mavericks. It would not let me login with current credentials. I had no choice but to hard power off. It returned to normal operation on restart.

It could be a possible bug.

Info:
Mac Pro, OS X Mavericks (10.9.4)

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Info:
MacBook

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(according to AHT)
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Info:
MacBook Pro, Mac OS X (10.7.4)

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Info:
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Info:
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Info:
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Let me backtrack:  I've run verify permissions and repair permissions. 

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and then the conclusion: 

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Info:
PowerBook, Mac OS X (10.5.8), G$ 17"

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Info:
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