Leopard Tiger Upgrade on G4 1GHz Sonnet Encore-Shuts down on install reboot

G4 1GHz Sonnet Encore (upgraded from Dual 450)
1.25 GB RAM
130GB HD
SuperDrive
Radeon 7500 32MB
Apple 17" Studio LCD
I've replaced my G4 DP 450MHz with a Sonnet Encore 1GHz upgrade, so I could successfully install and run Leopard. I'm using the upgrade DVD that camee with my iMac Core2.
The G4 has Tiger 10.4.11 installed and ran much faster after I upgraded the Encore 1GHz processor.
Leopard upgrade successfully installs. It reboots and I get the gray screen w/ Apple logo and loader circle animation.
Then the machine shuts itself down- turns completely off! Every time... I've even reinstalled the upgrade and it still happens.
This is also exactly what happened when I used LeopardAssist on the Dual 450 Processor, and a major reason why I bought the 1GHz processor upgrade.
"CPU Accelerator" was used on the G4 but I disabled it from startup before installing the upgrade. Also used in Tiger was "RapidoStart", which I didn't disable from startup items. Could that be whats shutting the machine down on Start Up?

iluvmax wrote:
G4 1GHz Sonnet Encore (upgraded from Dual 450)
1.25 GB RAM
130GB HD
SuperDrive
Radeon 7500 32MB
Apple 17" Studio LCD
I've replaced my G4 DP 450MHz with a Sonnet Encore 1GHz upgrade, so I could successfully install and run Leopard. I'm using the upgrade DVD that camee with my iMac Core2.
The G4 has Tiger 10.4.11 installed and ran much faster after I upgraded the Encore 1GHz processor.
Leopard upgrade successfully installs. It reboots and I get the gray screen w/ Apple logo and loader circle animation.
Then the machine shuts itself down- turns completely off! Every time... I've even reinstalled the upgrade and it still happens.
This is also exactly what happened when I used LeopardAssist on the Dual 450 Processor, and a major reason why I bought the 1GHz processor upgrade.
"CPU Accelerator" was used on the G4 but I disabled it from startup before installing the upgrade. Also used in Tiger was "RapidoStart", which I didn't disable from startup items. Could that be whats shutting the machine down on Start Up?
As I recall, Leopard checks the original processor speed. If the sonnet upgrade is not specifically marked Leopard Compatible, it probably won't work.
You might attempt to install Leopard from another PPC that meets the requirements, via the FW target disk mode, as others have done. Whether Leopard will actually run is something else.

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Leopard Tiger Upgrade on G4 1GHz Sonnet Encore-Shuts down on install reboot

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