![]() ![]() Mine reads:Īpple PowerMac4,1 4.1.9f1 BootRom built on 09/14/01 at 13.18.04įor a slot loading iMac, this article indicates that you need to be running 9.1 or later version of Mac OS Classic. The first output line contains the firmware level. Power on your iMac while holding down command It reside on a PROM ( program read only memory ) chip on the logic board.įiguring out what level of firmware you have?ġ) Mac OS 9.x or 8.x, you need to use the Apple System Profiler.ģ) Open Firmware, boot into Open Firmware. It does some hardware testing and some hardware configuration then passes control to your version of Mac OS. The firmware software receives control when you poweron your machine. ) Installing 10.2 with a down level firmware will most likely make your iMac unusable and difficult to fix. You need to figure out the level of your firmware before installing 10.2 or greater. If you have another PPC with firewire, you could try target Disk mode and installed tiger that way. It needs to be firewire and bootable by Mac OS. Take it apart & attach a 5 inch dvd drive. Find an external 3 1/2 inch harddrive enclosure that is bootable. ![]() I "built" my external dvd drive from parts. ![]() You may use an external firewire dvd drive. ![]()
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