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g5 wont start

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Post time: 2014-01-23 08:32:32 |Show all posts
I gave a dual processor G5 Mac Pro that wont start. This happened after it had sat unplugged fro a prolonged time. Now when I push the startup button, the power light goes on momentarily, there is a click, and then the power light goes off. I have replaced the 3.6V battery and pressed the small setet button on the logic board. Still same problem.
   
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Post time: 2014-01-23 18:07:27 |Show all posts
Sounds like the PSU is bad, can you test it?
https://discussions.apple.com/thread/2612757?start=0&tstart=0
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Post time: 2014-01-23 16:12:18 |Show all posts
Thanks very much for the responses.
There is a red LED near the power button that flashes momentarily before the power shuts off.
Resets involving key combinations are not a posibility because the machine will not power on.
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Post time: 2014-01-23 14:18:48 |Show all posts
You can try resetting the NVRAM. When you press the power button, hold down cmd-option-O-F
When you get to a promt, type reset-nvram and press return.
Then type reset-all and press return.
If this doesn't work, you may want to consider looking on ebay for a replacement power supply, although it's also possible the you have a bad logicboard/motherboard.
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Post time: 2014-01-23 12:44:20 |Show all posts
Unplug all peripherals, Monitor & power, pull PRAM Battery, let sit 30 minutes, hook power back up, put PRAM Battery back & see if it starts.
Also check if there's a red led lit on the logic board & that the plastic sheilds swith/sensor hasn't come loose.
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Post time: 2014-01-23 11:08:41 |Show all posts
It's a G5
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Post time: 2014-01-23 09:40:31 |Show all posts
Firstly there are PowerMac G5s, and then there are Intel (non-PowerPC) Mac Pro.
Mac Pro came out Aug 2006 1,1
http://www.apple.com/support/macpro
http://www.apple.com/support/powermac
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