My Intel iMac Dual 2.16 (running 10.4 (.10?) is hooped, and I'm hoping to get it running again without having to wipe the hard drive. It won't boot up - instead of the regular apple icon on boot up it flickers between the apple icon, the kernel panic (prohibitory) icon and the folder with a question mark icon. Here's what I've tried so far: 1. zapped the pram 2. booted up from the install disc and tried running disk utility. It won't repair permissions - says "Error: No valid packages". It also won't repair disk - says "Invalid sibling link". 3. Tried archive and install - no luck, says "won't verify the installation volume". 4. Tried booting up in safe mode - won't do this - I get the big prohibitory icon and then some text in the upper left corner. This text reads: "panic (cpu 0 caller 0x003A92A1) : Unable to find driver for this platform: "ACPI" Debugger called: <panic> Backtrace, Format - Frame : Return Address (4 potential args on stack)" and then some long strings of numbers and letters (that I could provide if it will help someone troubleshoot), and then "Backtrace terminated - invalid frame pointer 0x0". Oh yeah - I also ran the extended hardware test and nothing showed up. Any help on this would be greatly appreciated. I'm really hoping that I don't have to wipe my hard drive, also hoping that the hard drive is not hooped, but would like to know what to do in any case.