Question about Apple Power Mac G5

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G5 failing to startup

I have 2 Apple Macintosh G5 2GHz towers with 1GB of RAM. The first one is not booting. When I switch on, the fans come on, a red light in front is visible but there is no startup gong/chime and no display. How do I resolve this issue? Resetting the motherboard has not helped. The second one is much worse. When I switch on, the red light in front comes on and immediately switches off together with the computer. I have removed the battery, reset the motherboard by pressing the button on the motherboard. If I leave it overnight then and put back the battery in the morning, the computer works beautifully. The problem will start again if I shut down. Please can you help?

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Sounds like the power supply is over heated or over powered. Check the fan is spinning at the back of the power supply or buy a new power supply which are very cheap these days.

Posted on Jul 28, 2009

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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. 

Posted on Jun 07, 2009

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SOURCE: PM G5 has red light at front before switching on

It could be your motherboard but I would first try a Apple hardware disk and run the diagnostic tests.  If you can't boot from the DVD you could try a PRAM reset.  I have seen other weird issues with the hard drive not mounting which causes the fans to run loud.  The Apple Diagnostic disk comes in your original software pack and its usually on the 2nd or 3 DVD.  Sometimes the CPU speeds get out of whack and they need to be recalbrated. 

Posted on May 02, 2009

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