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Old Apr 3rd, 2010, 12:10 PM   #1
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PowerMac G5 CPU downgrade from 2 x DP to 1 x DP

Hi All,

Just fairly new to the forum and just wanted to break my silence with a quick mind boggling questions (for me anyway)

My PowerMac G5 DP 2.5 had one of the CPU die on me so it wont even boot-up, I have read that if i can find a G5 1.8 DP CPU from the same series that I can get my Mac to work again so can anyone confirm this?

Here is my MAC specs - Power Macintosh G5 2.5 DP (PCI-X) Specs (Mid-2004, M9457LL/A, A1047, PowerMac7,3) @ EveryMac.com

Thanks again...
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Old Apr 3rd, 2010, 12:19 PM   #2
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did a bit of a speed reading, but mine is the same as yours, well close too, but mine is water cooled and sadly enough, one of my cooling fan stopped working, but as for the cpu side of it, try to find another cpu of about the same speed used off another machine, if you can find one.

if it ain't water cooled, you can easily swap or remove one of the faulty cpu and run it as a single processor. also have a lot of patience as the cpu ain't as easy as it looks to remove if you don't have the proper tool. good luck!

Let us know how it goes.
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Old Apr 3rd, 2010, 12:23 PM   #3
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Quote:
Originally Posted by AquaAngel View Post
did a bit of a speed reading, but mine is the same as yours, well close too, but mine is water cooled and sadly enough, one of my cooling fan stopped working, but as for the cpu side of it, try to find another cpu of about the same speed used off another machine, if you can find one.

if it ain't water cooled, you can easily swap or remove one of the faulty cpu and run it as a single processor. also have a lot of patience as the cpu ain't as easy as it looks to remove if you don't have the proper tool. good luck!

Let us know how it goes.

Thanks but apparently running the box with 1 CPU does not work i need both good ones for it to boot up.

Yeah i do think best bet is replace it with the same speed to perform a quick swap as mine is not watercooled but getting 1 2.5CPU for a G5 for some reason isnt too easy
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Old Apr 3rd, 2010, 12:37 PM   #4
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i don't think i saw this on this site, but there is a way to run only one CPU that is still working "bypass" by a SUdo command in the terminal or open firmware. it actually will run on only one CPU. you can look or google it, i know i saw it online yesterday, will see if i can find it and will post it here.
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Old Apr 3rd, 2010, 01:05 PM   #5
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Quote:
Originally Posted by AquaAngel View Post
i don't think i saw this on this site, but there is a way to run only one CPU that is still working "bypass" by a SUdo command in the terminal or open firmware. it actually will run on only one CPU. you can look or google it, i know i saw it online yesterday, will see if i can find it and will post it here.

Thanks anyway i just checked it out i got it wrong mine is watercooled so i guess im pretty much left with little outs
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Old Apr 3rd, 2010, 03:23 PM   #6
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well the best hope that i can think of, is to find another CPU from the same model as the one you have and then swap it.
just put a wanted add online and i am pretty sure that something will come up.

Good luck
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Old Apr 3rd, 2010, 05:16 PM   #7
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I came across the following for a G5 DP not booting properly you could try:

If you have a dual-processor machine and the second processor is the problem then your machine will hang at the Apple logo. If the first processor is the problem then it will probably not even chime on power-up.

If this is indeed your problem you can try to disable the second processor.

Boot into Open Firmware by holding down Cmd-Opt-O-F
At the prompt "0 >" type
setenv boot-args cpus=1

You should get an OK back.

Type
mac-boot

To get back to the default nvram settings, at the open firmware prompt type
reset-nvram
or reboot with Cmd-Opt-P-R to reset nvram

I also posted a different reply for a used G5 and parts to your other post in case you missed it:
http://www.ehmac.ca/anything-mac/856...downgrade.html

Patrick
--------
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Old Apr 3rd, 2010, 06:28 PM   #8
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Quote:
Originally Posted by pm-r View Post
I came across the following for a G5 DP not booting properly you could try:

If you have a dual-processor machine and the second processor is the problem then your machine will hang at the Apple logo. If the first processor is the problem then it will probably not even chime on power-up.

If this is indeed your problem you can try to disable the second processor.

Boot into Open Firmware by holding down Cmd-Opt-O-F
At the prompt "0 >" type
setenv boot-args cpus=1

You should get an OK back.

Type
mac-boot

To get back to the default nvram settings, at the open firmware prompt type
reset-nvram
or reboot with Cmd-Opt-P-R to reset nvram

I also posted a different reply for a used G5 and parts to your other post in case you missed it:
http://www.ehmac.ca/anything-mac/856...downgrade.html

Patrick
--------
Wow great advice i will try that and see how it goes
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Old Apr 3rd, 2010, 07:45 PM   #9
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Quote:
Originally Posted by pm-r View Post
I came across the following for a G5 DP not booting properly you could try:

If you have a dual-processor machine and the second processor is the problem then your machine will hang at the Apple logo. If the first processor is the problem then it will probably not even chime on power-up.

If this is indeed your problem you can try to disable the second processor.

Boot into Open Firmware by holding down Cmd-Opt-O-F
At the prompt "0 >" type
setenv boot-args cpus=1

You should get an OK back.

Type
mac-boot

To get back to the default nvram settings, at the open firmware prompt type
reset-nvram
or reboot with Cmd-Opt-P-R to reset nvram

I also posted a different reply for a used G5 and parts to your other post in case you missed it:
http://www.ehmac.ca/anything-mac/856...downgrade.html

Patrick
--------
there you have it, that was the command i was hoping to get for you, that was the one i saw last night. hope that works out for ya. thanks pm-r for this find
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Old Apr 4th, 2010, 10:38 PM   #10
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Success :)

Quote:
Originally Posted by pm-r View Post
I came across the following for a G5 DP not booting properly you could try:

If you have a dual-processor machine and the second processor is the problem then your machine will hang at the Apple logo. If the first processor is the problem then it will probably not even chime on power-up.

If this is indeed your problem you can try to disable the second processor.

Boot into Open Firmware by holding down Cmd-Opt-O-F
At the prompt "0 >" type
setenv boot-args cpus=1

You should get an OK back.

Type
mac-boot

To get back to the default nvram settings, at the open firmware prompt type
reset-nvram
or reboot with Cmd-Opt-P-R to reset nvram

I also posted a different reply for a used G5 and parts to your other post in case you missed it:
http://www.ehmac.ca/anything-mac/856...downgrade.html

Patrick
--------
Thanks Patrick and Angel you guys helped me out big...wow nice first impression of the forum , i see 1 CPU but i get now is just a waiting game see how long this rig will last me maybe its a sign to go for a newer box

Again thanks alot everybody
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