FORCEFULLY Installing Leopard on 350-800MHz G4

You could. Or, you could FireWire them together, start the unsupported one in Target Disk Mode, and install it from the 867 MHz or faster G4.

Sawtooth811 said:

WOW. REALLY!?!?

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Just trying to be helpful...you didn't mention that this wasn't an option for you.

kflook said:

You could. Or, you could FireWire them together, start the unsupported one in Target Disk Mode, and install it from the 867 MHz or faster G4.

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I tried to do this very thing the other day, and got a strange message saying that Leopard couldn't be installed on the machine due to the disk formatting. I was a bit surprised since the HD is formatted as Mac OS Extended (Journaled). Has anyone else had this experience? I'm afraid the only way to get Leopard on this machine (800 Mhz G4 iMac) is to do a erase & install. I hope I'm wrong!

If you don't have access to another PowerPC machine for the install, you can also do it by temporarily changing the clock speed as reported by OpenFirmware (Google it).

kflook said:

Just trying to be helpful...you didn't mention that this wasn't an option for you.

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He's not being sarcastic, he's just an idiot.

admiraldennis said:

He's not being sarcastic, he's just an idiot.

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haha, but I have an older imac I am on actually that isnt supported. Forcefully did it through a powerbook. It works decently on the imac 2. As long as you dont use up to much harddrive space!

Sawtooth811 said:

Is it possible to get the new Mac OS X 10.5 Leopard on the old G4 by:

1. Take HD out of G4
2. Place HD inside external drive casing
3. Plug EXT. HD into 867MHz or faster G4
4. Install Leopard on HD?
5. Place HD back in G4?
6. Leopard Works???

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Does anyone know if the above steps would work with a G3 350MHz ? Thanks.

Wow, thats gotta be slow. I know someone who put it on a 1ghz G4 and he said it was noticeably slower than Tiger....but a 350? I guess whatever floats your boat.

There are a few easy ways. One is to temporarily setting the CPU clock higher (artificially... doesn't actually change it) in the openfirmware. Or you can burn a modified OS install disk and install from that.

do u think it would work if i installed it off my 1ghz emac onto my friends ibook g4 800mhz?

MacHappytjg said:

do u think it would work if i installed it off my 1ghz emac onto my friends ibook g4 800mhz?

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I don't think hard drive swapping will work because those two units have different HD sizes, but the firewire trick ought to do it.

KingYaba said:

I don't think hard drive swapping will work because those two units have different HD sizes, but the firewire trick ought to do it.

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yea lol a ide wont fit in a macbook and since its a ata i planned on doing the target thing for my friend

This will Fix it ...

To install Leopard on an "unsupported" G4 clocked under 867 MHz:

1. Reboot your Mac and hold down the Cmd-Opt-O-F keys until you get a white screen with black text. This is the Open Firmware prompt.

2. Insert the Mac OS X Leopard Install DVD.

3. Type the following lines exactly as shown below into the Open Firmware prompt. Be mindful of capitalization, spaces, zeros, etc. If the command is properly typed and understood, Open Firmware will display "ok" at the end of each line after you hit "return". What these lines do is set the CPU speed reported by Open Firmware to OS X as an 867 MHz G4 processor system. They then continue the boot from the DVD drive.

For single CPUs, use the following three lines:

dev /cpus/PowerPC,G4@0
d# 867000000 encode-int " clock-frequency" property
boot cd:,\\:tbxi
For dual CPUs, use the following five lines:

dev /cpus/PowerPC,G4@0
d# 867000000 encode-int " clock-frequency" property
dev /cpus/PowerPC,G4@1
d# 867000000 encode-int " clock-frequency" property
boot cd:,\\:tbxi
4. Continue the install normally.

5. This CPU setting is only in effect until the Mac reboots. Once OS X Leopard is installed and your Mac has rebooted, the proper CPU speed should once again be displayed when you select About This Mac under the Apple menu

still not working

Hi
Tried the open firmware prompt (two versions,there´s another one on the web with min-clock-frequency and max-clock-frequency) but the g4 powerpc 667mhz 512 sdram still won´t install. ("cannot install on this computer".
any ideas? not sure I know enough to go through the disk image process,unless there´s a step by step somewhere.
The leopard disk came with my intel macbook and is a 2 disk.could this be one the reason?
Desperate ....need it to run a program for work...
thanks

You should have made a new thread rather then revive an old one. The reason it doesn't work is because it is a gray restore dvd. Not a black retail one that can be used with any Mac.

Mac Man 82 said:

To install Leopard on an "unsupported" G4 clocked under 867 MHz:

1. Reboot your Mac and hold down the Cmd-Opt-O-F keys until you get a white screen with black text. This is the Open Firmware prompt.

2. Insert the Mac OS X Leopard Install DVD.

3. Type the following lines exactly as shown below into the Open Firmware prompt. Be mindful of capitalization, spaces, zeros, etc. If the command is properly typed and understood, Open Firmware will display "ok" at the end of each line after you hit "return". What these lines do is set the CPU speed reported by Open Firmware to OS X as an 867 MHz G4 processor system. They then continue the boot from the DVD drive.

For single CPUs, use the following three lines:

dev /cpus/PowerPC,G4@0
d# 867000000 encode-int " clock-frequency" property
boot cd:,\\:tbxi
For dual CPUs, use the following five lines:

dev /cpus/PowerPC,G4@0
d# 867000000 encode-int " clock-frequency" property
dev /cpus/PowerPC,G4@1
d# 867000000 encode-int " clock-frequency" property
boot cd:,\\:tbxi
4. Continue the install normally.

5. This CPU setting is only in effect until the Mac reboots. Once OS X Leopard is installed and your Mac has rebooted, the proper CPU speed should once again be displayed when you select About This Mac under the Apple menu

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So pleased !!! Worked for my iLamp 800mgz !!! Many Thanx!!!