[G4] Power issues

[Harry Freeman]

Greetings Robert

IIRC the G4 (all models) suffer from a power on/off switch problem.  
Although my G4 is a 1999 AGP that started life as a 350Mhz and now is  
a 1.2Ghz and my switch is still working fine. I guess because I almost  
never use it unless the platform is complete powered down at which  
time that is the only way to startup.

However this switch only activates a relay on the mother board that  
changes the status of the power relay i.e. on/off.

I would suggest that you open your case and, using one of those  
compressed air cans (you can get them at a lot of places like Office  
Depot and others locations) rid your platform of all accumulated dust.  
Dust in the power supply and on the mother board. I would also  
recommend that after you shutdown the Mac that you let it cool down  
for at least 15 mins. before using the compressed air.

And while you have it powered down that you depress the CUDA switch  
and if you haven't replace the Pram Battery that it might be a good  
time for replacement.

In addition I would recommend that you reset PRAM and the Open Firmware.

Cheers

Harry
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On Jan 3, 2010, at 2:11 PM, Robert Walker wrote:

> Hello and happy new year,
>
> My G4  will not shut down . When I choose shutdown it automatically  
> restarts. Also once I manage to shut it down (Power button on from  
> of machine) it is becoming very difficult to start. Am I looking a  
> getting a new power supply? I greatly appreciate all replies to this  
> request.
>
> Sincerely,
>
> Rob Walker
>
>  Machine Name:	Power Mac G4 (AGP graphics) Mac OS 10.4.11
>   Machine Model:	PowerMac3,1
>   CPU Type:	PowerPC G4  (3.3)
>   Number Of CPUs:	1
>   CPU Speed:	1.4 GHz
>   L2 Cache (per CPU):	256 KB
>   L3 Cache (per CPU):	2 MB
>   Memory:	640 MB
>   Bus Speed:	100 MHz
>   Boot ROM Version:	4.2.8f1
>
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