User profile for user: bruno1987
bruno1987 Author
User level: Level 1
5 points

Power Mac G5 not booting stuck on apple logo

Hi everyone,

I recently got my hands on a Power Mac G5 7.3, the computer worked normally for a day or two when suddenly while browsing in 'About this Mac' it froze, nothing responded. I had to shut it down from the power button but since then the computer doesn't boot anymore, it hangs on the gray screen with the apple logo with no 'spinning wheel', I only managed once to get it to boot by changing the system date but it only worked for a few seconds, it froze again. Here's what I've already tried to do:

-Changing the PRAM battery

-Resetting the PMU

-Reset nvram, set defaults, reset-all, in Open Firmware

-Starting from the Install DVD with and without the HDD connected

-Apple Hardware Test: everything passed

-Reseat the Video Card

-Put the RAM into different slots

-Boot in Verbose, it stops at 'DART enabled'

The result is always the same, the only thing I can do is enter the Open Firmware

Posted on Jan 4, 2023 08:36 AM

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User profile for user: BDAqua
BDAqua
User level: Level 10
250,031 points

Posted on Jan 7, 2023 11:42 AM

Yes, the U3 chip under the RAM slots was the biggest cause of failure.


From my notes...


Older meanings...


Can you count the beeps or flashes?


1 beep = no RAM installed

2 beeps = incompatible RAM types

3 beeps = no good banks

4 beeps = no good boot images in the boot ROM (and/or bad sys config block)

5 beeps = processor is not usable


In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.


Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length.


http://support.apple.com/kb/HT1547


LED 1—CPU A: red—contact Apple or an Apple Authorized Service Provider 

LED 2—Overtemp: red—contact Apple or an Apple Authorized Service Provider 

LED 3—Power On: red—the main power is on 

LED 4—Trickle: yellow—Power Mac G5 is plugged into the wall correctly 

LED 5—Open Firmware good: green—no problem 

LED 6—CPU B: red—contact Apple or an Apple Authorized Service Provider 

LED 7—Checkstop: red—contact Apple or an Apple Authorized Service Provider


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User profile for user: BDAqua
BDAqua
User level: Level 10
250,031 points

Jan 7, 2023 11:42 AM in response to bruno1987

Yes, the U3 chip under the RAM slots was the biggest cause of failure.


From my notes...


Older meanings...


Can you count the beeps or flashes?


1 beep = no RAM installed

2 beeps = incompatible RAM types

3 beeps = no good banks

4 beeps = no good boot images in the boot ROM (and/or bad sys config block)

5 beeps = processor is not usable


In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.


Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length.


http://support.apple.com/kb/HT1547


LED 1—CPU A: red—contact Apple or an Apple Authorized Service Provider 

LED 2—Overtemp: red—contact Apple or an Apple Authorized Service Provider 

LED 3—Power On: red—the main power is on 

LED 4—Trickle: yellow—Power Mac G5 is plugged into the wall correctly 

LED 5—Open Firmware good: green—no problem 

LED 6—CPU B: red—contact Apple or an Apple Authorized Service Provider 

LED 7—Checkstop: red—contact Apple or an Apple Authorized Service Provider


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User profile for user: K Shaffer
K Shaffer
User level: Level 8
35,884 points

Jan 7, 2023 02:33 AM in response to bruno1987


..bruno1987..

Yours by chance, wasn't a liquid-cooled model; usually but not limited to quad-core PPC G5?


Here’s one of a saved few bookmarked PM_G5 links, for liquid cooled, and etc.

1] https://www.xlr8yourmac.com/systems/G5_CoolantLeak_Repair/G5_CoolantLeak_Repair.html


(secondary links in links, may/not function now)



2] https://www.ifixit.com/Guide/Power+Mac+G5+Processor+and+Cooling+Unit+Replacement/1953



LowEndMac.com has groups of various models, & etc.

G5 Models

https://lowendmac.com/2005/power-mac-index/



•Power Mac G5 Quad (Late 2005)

2005.10.19 LEM Staff, 

•Power Mac G5 Dual (Late 2005)

•Power Mac G5 (Early 2005)

•Power Mac G5 (Late 2004)

•Power Mac G5 (Mid 2004)

•Power Mac G5 (Mid 2003)

[2003/2004/2005?]


Harder to get replacement/repair parts now.

https://eshop.macsales.com/upgrades/powermac7-3

https://eshop.macsales.com/upgrades/apple-power-mac-g5-2x2-5ghz-june-2004


At times their power supplies can act up.

And links ~ within links can go stale!


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Power Mac G5 not booting stuck on apple logo

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