Powermac G5 stuck on apple logo with max speed fan

Question

Level 1

8 points

Powermac G5 stuck on apple logo with max speed fan

PowerMac G5 running Mac OS 10.5.8, get stuck while booting on the apple logo and the fans starts working on high speed.

Reseting PRAM allowed me to boot once, but the following day it got stuck in the same place.

Then I removed the RAM and placed them in different sockets,and started ok, restarted also ok, but the following day the problem came again.

what is preventing the system from booting normally.

And what can I do to fix that problem.

Thank you.

PowerMac, Mac OS X (10.5.8), G5

Posted on Feb 7, 2015 4:23 AM

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Answer 1

kaz-k

Level 8

49,044 points

Feb 7, 2015 6:14 AM in response to nahel001

Resetting SMU could solve the problem.

How to reset the SMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005) - Apple Support

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Answer 2

nahel001 Author

Level 1

8 points

Feb 7, 2015 7:47 AM in response to kaz-k

Resetting the SMU didn't help either.

and when I boot with CMD S it stops at the Line : "DART enabled"

as shown in the attached shot.

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Answer 3

BDAqua

Level 10

239,063 points

Feb 7, 2015 10:29 AM in response to nahel001

Might try this...

http://alexking.org/blog/2006/12/15/powermac-quad-ram-fix

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Answer 4

Feb 11, 2015 5:52 AM in response to BDAqua

Hello,

When my G5 bi-pro (2.5 Ghz) watercooled had not water enought, he got the same symptoms 😢.

I disassemble the water blocks, I clean the inside water block (very thin slots of copper) (*), I make the waterproofness of the two blocks, fill with water and anti-alga and the temperature don't encreased up to 60°C (140 °F) and the G5 can start witout freezing.

Best regards

(*) Two years ago he mad the same symptom than before : the thin slots of copper are oxyd black. I clean the oxyd with chlorid acidand he restart.

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Answer 5

BDAqua

Level 10

239,063 points

Feb 11, 2015 9:35 AM in response to lilfromsaint just

Good work, thanks for the report! 🙂

My Quad is in need of that now. 😟

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Answer 6

nahel001 Author

Level 1

8 points

Feb 14, 2015 10:10 PM in response to nahel001

Thanks BDAqua , it worked.

And Thanks lilfromsaintjust for the valuable information.

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Answer 7

BDAqua

Level 10

239,063 points

Feb 15, 2015 10:28 AM in response to nahel001

Gtrat news, thanks & good luck! 🙂

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Answer 8

Mar 29, 2015 4:57 PM in response to nahel001

This happened to me as well. It was caused by a bad HDD and I also ended up needing to reseat my video card because dust was getting in between the card and the board. Once I did that and put in a new hard drive with a fresh Leopard install, everything was perfect. I have a PowerMac G5 7,3.

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