Question about Apple Power Mac G5

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My Mac G5 Power PC shuts down

It sounds like the fans are revving up for takeoff. Then, a red light comes on and it seemingly goes to sleep. It usually happens when I am exporting a High Def quicktime from Final Cut Pro or rendering in Final Cut Pro. Anything that takes a lot of processor power sends it into this mode. I may have just answered my own question LOL. If it has to do a difficult task, it shuts down. I can surf the internet all day. I can edit in FCP all day. I can work in Photoshop, Illustrator, etc. No problems, but if I try capture footage into FCP, it will work fine for five or ten minutes, then the fans start roaring and the red light comes on and "click". It takes a nap. I can press a button on the keyboard, and it comes back, but the red light stays on. I have to shut it down for a while, as if it needs to cool off. I restart and I'll get about ten more minutes of video input, then nighty night. It goes to sleep. Please help.

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Possibly heat related. 

  • As much as I liked the G5 series macs, the Imac G5's were always problematic. They were always coming in for issues related to them shutting down on their own, and never turning on again. Cramming that G5 cpu in such a tight space was not such a great idea.
  • Taking the motherboard out and giving it a good cleaning helps alot, the mixed use of copper and aluminum seems to cause alot of corrosion around the CPU, especially on the heatsink, it starts to grow green stuff after a year or so in service. Not good. The machine cuts off randomly and sometimes will not boot up at all and the light will glow bright. Other times it will boot and the start up sound is all crackly. Fun times. 

    Still prefer the G5's and PowerPC's in general to intel **** macs.

Posted on Dec 29, 2008

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It meant the processor is over heating. you need to open it up and change the processors heat sink and fant, A clip holds it in place. You can also try cleaning it, but most often it would need to be changed. Take the old one with you to a store when purchasing a new one.

Posted on Dec 29, 2008

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Sounds like a overheating problem , better do some cleaning on yoru computer including the fan and if also possible to add some more cooler to your tower so it wont overheat...

Posted on Dec 29, 2008

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I would bet on a power supply problem. You have signs of overheating somewhere. Can you open it up and check for dust build up that may be interfering with the cooling?

Posted on Dec 29, 2008

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There are seven diagnostic LEDs near the memory banks of this model: six in a tight line between the edge of the logic board and DIMM bank 1, and the seventh just underneath DIMM bank 1 and slightly more inboard. Please tell me which of these LEDs are on and I will tell you what they mean.

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SOURCE: Why does my Mac get stuck in sleep mode to where I

change the stand-by settings!

Posted on Oct 17, 2011

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1 Answer

Fans don't run


Thank you for the complete and literate problem statement.
The red light in question will come on and the media bay fan will spin at high speed if the plastic air deflector door is not in place, OR the white sensor label on the lower right tab of the air deflector door is damaged or out of position, OR the air deflector sensor board is faulty.
You can differentiate a bad sensor label from a bad sensor board by doing the following: Remove the air deflector door. Slide a folded piece of paper through the slot in the enclosure where the right tab of the air deflector would normally be inserted. If the red LED goes out (but stays on with the door in place), the sensor label on the door is missing or damaged.

You will also want to check the sensor board cable connection on the logic board (second from right connector located directly below the hard drives).

Subsequent failure for the fans to run does not necessarily indicate a problem, as the fans are temperature-controlled and will not run until heat rises to a certain level. If the fans are not coming on even when the heat is sufficient, you may need to reset the SMU by shutting down the computer, unplugging the AC cord, waiting 15 seconds, and then replugging and restarting the computer.

May 13, 2010 | Apple PowerMac G5 Dual Mac Desktop

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Why does my desktop pro keeps shutting down unexpectedly


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).

Apr 28, 2010 | Apple Power Mac G5 Desktop

1 Answer

Power up IMac but screen blank, fan on, light on but no response


I have one doing exactly this at the moment. It had gone to sleep and the fans were going like crazy. I think it is a Motherboard failure (it happened with many G5 iMacs), this one has been replaced once already, and I can't actually get it to install anything. I'm taking it apart tomorrow to see what I can find inside. If I fond anything I'll let you know.

Aug 07, 2009 | Apple iMac G5 Desktop

2 Answers

Power light goes out but power remains thru the m-board fan runs


you need to replace the power supply. The fan sound is the fan for the power supply and not the computer. for cheap parts or used goto headgap's. They know what you need and probably even help you replace it yourself.

Jul 03, 2009 | Mac Desktops

1 Answer

My Imac G5 has a long tone and flashing sleep light upon pressing the power button. It also no longer sleeps. When I put it to sleep it immediately shuts down and doesn't go through the normal shut down...


The long tone and flashing light has to do with your firmware. If your mac boots up, you could try to download the latest firmware update and install it. But more than likely you will need to take this one into the shop.

Jun 20, 2009 | Apple iMac G5 Desktop

2 Answers

PowerMac G5 fan keeps running -- LOUDLY


I had the same problem... It is the logic board... You need to get it replaced. One way you could try to fix it by resetting the board there should be a little black dot behind the front two fans when you open it up. Press and hold for a few seconds... this resets the board to factory settings. The other way is replace the internal battery. and the third is to replace the logic board. $150-200

Jun 04, 2009 | Apple PowerMac G5 Dual Mac Desktop

2 Answers

G5 failing to startup


Two things.  1. Boot from the original install disk and choose your language. Don't install the software, look up to the menu and find disk utility. You will run disk utility on your mac from the CD. You boot to the CD by holding down the "C" button during startup. 
2. If you had the insight to set up an emergency user, see if the problem occurs on both users. Sounds like it happens right off, so I think solution 1 is best. Once you get things running, set up another user. I call the account Emergency and use Emergency as the password. This is used for, you guessed it, emergencies. What this does is isolate the problem to the user or the computer. 
Apple has a great knowledge base to search for solutions as well. Good luck. 

Apr 20, 2009 | Apple Power Mac G5

1 Answer

G5 has insomnia won't stay in the sleep mode


Usually this is caused by a USB printer unnecessarily clamoring for attention.
Disconnect ALL your USB devices and the problem ought to go away. Then connect them one by one to find out which the culprit is.
To zap PRAM, shut down the Mac, then push the start button and immediately hold down Command-Option-P-R until you hear the chimes pass by three times. But I don't think this will affect your problem.

Apr 15, 2009 | Apple iMac G5 Desktop

1 Answer

G5 Mac Desktop freezes at random


First you need to run some maintenance (which in itself may solve it) to rule out software issues, so start here...  
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
 
Mac OS X: How to start up in single-user or verbose mode
 
If that doesn't help, try booting into Safe Mode and see what happens, if it comes up hopefully another restart may solve, if not, you can at least use this as a starting point to try and resolve. Safe Mode will allow you to get around, surf, etc...
  
What is Safe Boot, Safe Mode?
  
Mac OS X: Starting up in Safe Mode

If Safe Mode comes up alright, I would install AppleJack, excellent troubleshooting article can be found here... Troubleshooting Tools: AppleJack
 
Another excellent free tool for performing maintenance is Onyx (be sure to download the right version for your system). Install the package, then run it, it will check your drive and the structure, after this, click on the automation tab and check on everything for Maintenance, Clear Cache, Cleaning, and check on Reset -> LaunchServices database and Mail's Envelope Index. When it completes, restart. Repeat any time something seems flaky, if not try to run at least once a month.

Feb 04, 2009 | Apple Power Mac G5 Desktop

1 Answer

Power PC G5 Dual 2.5 sudden shutdown and no reboot


In G5 always the cover should be closed properly if not it will start the fan very fast like a blower and the red leds will be on showing that the heat is over so please check that the cover is closed and locked from behind so itworks smooth and the power supply is standard or normal
u should always use genune parts with mac..
thanks

Dec 19, 2008 | Apple Power Mac G5 Desktop

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