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Old May 3rd, 2010, 03:52 PM   #1
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G5 troubleshooting

Hey All,

I would like to know how to go abouts figuring out how what may have gone wrong with my G5 DP 2.5 watercooled powermac.

Here is what happened I tried installing 10.5 in the powermac but had problems with it and decided to leave the DVD inside to try the install at a later time.

Anyway now I opened the box and disconnected the PSU from the logic board as I needed to take a picture of it.

after putting everything back the system would power on but i do not have light on the Front Led, no "gong" and no video input.

I have done the following as far as t/s:
-RESET PRAM
-pressed button on Logic board
-reseaded RAM, Video, CPU and PSU

Also when i open the mac the red led does not even come up to indicate intrusion alert.

Any help will be appreciated
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Old May 3rd, 2010, 04:25 PM   #2
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Are you able to boot of the OS X install disc?
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Old May 3rd, 2010, 04:54 PM   #3
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I dont think so i have the OSX dvd inside the system i cant even eject the disk to try change it with Tiger
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Old May 5th, 2010, 11:49 AM   #4
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G5 trouble

Hi qman,

With no front LED, no gong and no video out, your G5 is not powering up. Make sure your connections are good and tight. Might be Electro-Static Discharge (ESD) damage if you didn't take precautions. I've had the small front circuit board go bad on mine before and saw the same symptoms.

Good luck
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Old May 5th, 2010, 12:15 PM   #5
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Hello Laser,

The system does power up fans, CD-rom, HDD all make noise but no video or gong...ESD is something on my mind which i hope is not that case or else i guess its powermac heaven for this guy.

When I hold the power button i do get the led light but it does not stay on after i release it

Thanks,
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Old May 5th, 2010, 03:55 PM   #6
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qman,

No gong usually means a hardware problem. Front panel cct board <$100, PSU >$400 but costs at least $60 to find out.
I'm out of ideas. Upgrade time maybe?

Best wishes
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Old May 5th, 2010, 04:24 PM   #7
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Thanks Laser,

I am confused how can the front panel cct board give this type of symptoms does it just have power,usb,firewire and headphone.

If the system can boot means the power button is doing its job correct, dont get me wrong i do hope its the front panel it would be cheaper than a logic board i just want to know why.

Thanks for all the help
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Old May 5th, 2010, 10:36 PM   #8
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Whoa...before jumping to conclusions you need to determine whether this G5 has actually leaked. Sometimes the leaks aren't easily visible - they weren't in my G5. It's a known issue, though not one Apple has gone out of their way to publicize.

Apple is repairing these machines for FREE - even if they're long out of warranty as mine was. Or, if you're very lucky, as I was, they'll give you a new Mac Pro.

In my case, my G5 powered up (no bong though, if I recall) and then gradually the fans would rev up and up until they were running full blast. It sounded like there was a bit of drive activity early on, but nothing happened - no video signal etc.

I took my G5 down to Carbon Computing - who at the time (Nov. 2008) weren't aware of the leak issue and Apple's response, but should be now. They'll charge $65 or so for the diagnostic, which will be waved if it's an issue covered by Apple. Worth a try. And you will find out what is the matter regardless of the cause.

Do read the linked page below at xlr8yourmac.com - particularly the bit about what to stress when calling Apple, if Carbon do diagnose a coolant leak. It's a SAFETY issue. That, and the fact that the processors were out of stock at the time my G5 needed repair is the reason I was able to get a replacement rather than a repair. (Told them that I did 99% of my work on my G5 and several weeks waiting for a part on a machine that had a design defect was NOT acceptable. I was polite but firm - and am still surprised that Apple gave me a new Mac Pro!) You may need to advocate for yourself on this - Apple would have paid for the repair for me once Carbon talked to them, but the time was an issue, so I decided to call them myself.

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Last edited by Paddy; May 5th, 2010 at 10:47 PM.
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