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I NEED TO CHANGE A DEAD POER SUPPLY ON A G5 POWER MAC

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Go to geeks.com they have power suppplys for 15 bucks and lower thts where got my last one and its been working for months now

Posted on Oct 07, 2008

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My g5 keeps switing off,i've tryed mac-boot.still switching off.


powermac G5's are notorious for having bad power supplies. you might need to find a way to replace the power supply

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I have an apple mac g5 10.4 osx. the mouse has a light instead of ball and i got a warning the battery was going dead. i have bought 8 batterys and none work i bought panasonic cr2032 but no work. can you...


Thanks for contacting Fixya Support, I am glad to assist.

The issue may not be with the type of CMOS battery you are attempting to use, so much as what you are doing once you install the new CMOS battery.

You need to make sure that after you install the battery, before replacing the Air duct and closing the chassis, you press the SMU Reset button on the logic board then attempt to restart your Power Mac G5 and see if it makes a difference.

I would recommend you view the PowerMac G5 manual I have provided for you below, in order to get more a perspective on the process of replacing a battery in the PMG5.

Link:
Replacing the Battery in PowerMac G5

Let me know if this helps.

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Is this a liquid cooled G5? What CPU is it? Need as much info as possible like what where you doing last time it turned on? Have you looked inside the case? Do you hear any clicking when the power cable is connected for the first time? A lot of the last G5's were liquid cooled and a lot have leaked in the past. This small leak eventually ruins the power supply and worse yet ruins the logicboard and CPUs. If you don't know if it is liquid cooled look for a warning stamp on the bottom near front by the CPU fans (inside the case). It states to shut off if liquid is viable (something to that effect). Most times the liquid cannot be seen as it drips into the power supply on the very bottom. I would take it to Apple and have them check it out.

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Just to clarify a G5 is not a Pro or "desktop Pro" (Mac Pro is an Intel based machine). Yours is a "Power Mac". Install a temp monitoring app to see the temperature (mainly the CPU temps). Mine runs around 50 to 60 Celsius and never more than 72. If the temps run to high she will shut down. G5 are great machines but it's not rare for them to go bad. Power supply issues and liquid coolant leaks are well know. Fans controllers have stopped working (the fans them selves are usually OK).

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How to replace the power supply on a powermac G5


I would be very cautious doing this, if you are not an Apple tech. You can damage the connector for the G5 Processors, and render the machine un-usable.

You have to remove the RAM and Processor, then remove the two power connectors that connect from the power supply to the logic board. On the bottom, underside of the chassis, there are four screws. Remove them, then you can tilt the power supply out of the bottom of the unit.

Replacement, is just the reverse.

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Hi, Sorry to hear you are having problems,
Here is a very useful website:
http://g5.bhmm.net/
it will show you how to take apart a Powermac G5 step by step.

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Mac G5 shutdown and now won't power up


Sounds like a bad power supply. They do go bad... get a new one and hook it up without installing it. If it boots your machine...you've solved your problem. That battery retains some boot info and your date/time settings.

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There are specialist Mac repairers that can supply parts on the net. You should be able to find one reasonably local to you who will be able to supply you with a replacement as these items can't be reliably repaired.

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Solution: Replace power supply with a new one. Anything else might cause equipment damage, personal injury or death.

Any attempt for component level repair is not for the novice tinkerer. remember, opening the power supply might kill you.

My suggestion is to have the failed power supply module replaced with a brand new supply by a qualified repair technician.

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