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#1 2019-07-06 21:32:45

androidian5980
Member
Registered: 2019-07-04
Posts: 3

Power Mac G4 AGP LeopardAssist USB booting

Hello, I am trying to install Mac OS X Leopard on my PMG4 AGP. I am using LeopardAssist to try and boot into the installer, but doesn't work. I try to tell it to boot to the bootpicker, but all I get is a black screen. I am able to zap the PRAM to get back to Tiger, but thats about all I can to with LeopardAssist...


I am running the most up-to-date firmware for the PMG4 and running OS X 10.4.11


(edit) I forgot to mention that only 1 of the USB ports are working, and I have to use a hub to see the USB drive to boot, but I can't boot.

Last edited by androidian5980 (2019-07-06 21:40:25)

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#2 2019-07-07 16:34:47

thebasicgeek
Member
Registered: 2017-03-14
Posts: 7

Re: Power Mac G4 AGP LeopardAssist USB booting

unfortunately you will probably need a copy of leopard on dvd as in most cases power pc macs don't support booting from usb media


Personal Power PC mac - Powermac g4 mdd (mirror drive doors) - single powerpc 7455 (g4) @1.25ghz, 1.5gb pc2700 ram, ATI Radeon 9000 Pro graphics card with 64 MB of DDR SDRAM, Generic pci usb 2.0 card, dual ide superdrives (dvd writer) , ibm deskstar 60gb ide hdd running macos 9.22,
80gb ide hdd running macos 10.4.11 tiger, 160gb ide hdd running macos 10.5.8 leopard

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#3 2019-07-07 18:16:50

iMic
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From: Adelaide, Australia
Registered: 2014-05-12
Posts: 944
Website

Re: Power Mac G4 AGP LeopardAssist USB booting

LeopardAssist USB boot support is experimental at best, some machines supported it, some don't.

It uses the "boot ud:X,\\:tbxi" Open Firmware command that was introduced around the time of the iMac G5 and later PowerBook G4, and possibly in some earlier systems that received firmware updates, but the G4 AGP was almost certainly too early to support it. Installing from DVD, FireWire drive (or the installer imaged onto a second hard disk) is the best bet for that system.

The reason it was included in LeopardAssist (3.0) was as a "just in case" scenario should the machine support it, and also because while LeopardAssist isn't needed to install Leopard on G5 machines natively, it would assist with booting the Leopard installer from USB drives on those later machines, and so it still served a purpose.


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#4 2019-07-07 18:46:10

androidian5980
Member
Registered: 2019-07-04
Posts: 3

Re: Power Mac G4 AGP LeopardAssist USB booting

iMic wrote:

LeopardAssist USB boot support is experimental at best, some machines supported it, some don't.

It uses the "boot ud:X,\\:tbxi" Open Firmware command that was introduced around the time of the iMac G5 and later PowerBook G4, and possibly in some earlier systems that received firmware updates, but the G4 AGP was almost certainly too early to support it. Installing from DVD, FireWire drive (or the installer imaged onto a second hard disk) is the best bet for that system.

The reason it was included in LeopardAssist (3.0) was as a "just in case" scenario should the machine support it, and also because while LeopardAssist isn't needed to install Leopard on G5 machines natively, it would assist with booting the Leopard installer from USB drives on those later machines, and so it still served a purpose.

I have imaged the install to the second hard disk I have installed, but no success. About the USB booting, I imaged a YDL installer to a usb stick, and it did show up in the boot picker, but I didn't try booting it because I was installing from CD.

Last edited by androidian5980 (2019-07-07 18:46:43)

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#5 2019-07-08 18:29:25

androidian5980
Member
Registered: 2019-07-04
Posts: 3

Re: Power Mac G4 AGP LeopardAssist USB booting

So, I tried following a guide on YouTube which uses Open Firmware to change the CPU speed, but when I tried booting from the USB stick (connected to a hub) It's giving me a prohibitory symbol. Any ideas besides purchasing a DVD drive? CD booting? I'll try anything that doesn't involve me buying something.

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#6 2019-07-09 18:33:21

mcdermd
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From: Corvallis, OR
Registered: 2014-05-12
Posts: 1,021
Website

Re: Power Mac G4 AGP LeopardAssist USB booting

As stated before, that PowerMac will not boot from USB. You need to use an optical disc, firewire drive or hard disk drive.


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