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PostPosted: Mon Jun 22, 2015 8:30 am 
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My Quad Core G5 won't boot. After the tone, I see diagnostic LED #2 followed by #7 come on and stay illuminated. Sometimes it will get to the grey screen or maybe the Apple logo before this happens but not always.

Thinking I might have an overheat and possible coolant leak, I pulled my CPU/Cooling Core. I have the Cooligy version. No visible signs of leaking anywhere but a pipe could be clogged or a pump dead.

I replaced the core with a single pump back-up but I get the same results and diagnostic lights.

I tried reseating the RAM and swapping it around and going to a minimal 2 stick configuration but no change. I stripped down the system to the bare essentials and I also reset the PMU.

What else could be wrong? Faulty logic board?


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PostPosted: Mon Jun 22, 2015 9:08 am 
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Best guess so far besides Logic Board would be thermal paste needs replacing.


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PostPosted: Mon Jun 22, 2015 9:21 am 
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Is there a brand/type recommendation for thermal paste? Thanks.


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PostPosted: Mon Jun 22, 2015 9:35 am 
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MX3 or MX4...

http://www.arctic.ac/us_en/mx-4.html


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PostPosted: Mon Jun 22, 2015 7:15 pm 
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I pulled the CPU boards off the LCS and the thermal paste isn't very pasty anymore. Still no signs of the LCS leaking. I ordered some new paste and will try in a few days.

CPU A&B removed:
Attachment:
File comment: CPU A & B boards removed from LCS
P6221801-1024.jpg
P6221801-1024.jpg [ 341.03 KiB | Viewed 1172 times ]


LCS without CPU A&B attached:
Attachment:
File comment: Cooligy LCS without CPU boards attached.
P6221802-1024.jpg
P6221802-1024.jpg [ 290 KiB | Viewed 1172 times ]


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PostPosted: Mon Jun 22, 2015 7:51 pm 
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OK. :coffee:


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