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Mac G5 turns off
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Fresh-Faced Recruit
Join Date: Mar 2010
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Offline
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Hello everone,
my father has a real unnerving problem with his g5. it turns off just like that in a seemingly random
manner. somtimes it turns off while starting up, after restarting it turns off again, then it stays on for
a couple of minutes and then turns off, sometimes it stays on for several hours, and sometimes it
doesn´t turn off by itself at all - what is going on? does anyone have an idea?
thanks,
Heiko
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Moderator  Join Date: Apr 2000
Location: Gothenburg, Sweden
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Offline
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Sounds like overheating, possibly due to bad caps. Open the box up and check any capacitors on the motherboard. If they are bulging or leaking, they're bad and need to be replaced.
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The low-end Mac Pro is the most overpriced Mac since the IIvx
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Administrator  Join Date: May 2000
Location: California
Status:
Offline
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Check the power button for alignment - it should be flush with the front panel. Has his G5 ever been dropped or banged good? If the case were distorted, the front panel board with the power button may have intermittent contact with the motherboard contacts.
However, I'd guess a power supply issue. Is this G5 a liquid-cooled model (all models > 2 GHz)? If so, look for corrosion sign around/below the CPU module. Leaking coolant has a way of going down, and the power supply is the lowest component. It's in the 'basement' - the space below the compartment floor.
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Mac Elite
Join Date: Jun 2004
Location: Edmonton, AB
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That problem is usually caused by a power supply as reader50 mentioned.
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Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
Status:
Offline
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Originally Posted by reader50 
However, I'd guess a power supply issue. Is this G5 a liquid-cooled model (all models > 2 GHz)?
More specifically all models > 2.3 GHz.
(Last edited by Big Mac; Mar 30, 2010 at 02:44 AM.
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"The natural progress of things is for liberty to yield and government to gain ground." TJ
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Moderator Join Date: Apr 2000
Location: Gothenburg, Sweden
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Well if you want to be like that, there were two different 2.3GHz models, and at least one of them did not have liquid cooling. The only ones I know had liquid cooling were the 2.5 GHz and 2.7GHz models.
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The low-end Mac Pro is the most overpriced Mac since the IIvx
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Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
Status:
Offline
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I meant 2.3 GHz, sorry, and as far as I know there was only one 2.3 model - dual core air cooled.
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"The natural progress of things is for liberty to yield and government to gain ground." TJ
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Posting Junkie
Join Date: Nov 2000
Location: in front of my Mac
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There were two 2.3 GHz models. A dual single-core 2.3 GHz model (4/05-10/05) and a single dual-core 2.3 GHz model (10/05-8/06). Both of them were air-cooled.
The water-cooled models were the dual single-core 2.5 GHz model (7/05-4/05), the dual single-core 2.7 GHz model (4/05-10/05) and the dual dual-core 2.5 GHz model (11/05-8/06).
It is correct to say though that every Power Mac G5 with a clock >2.3 GHz came with liquid cooling. Conversely every Power Mac G5 ≤2.3 GHz was air-cooled.
(Last edited by Simon; Mar 30, 2010 at 03:07 AM.
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