I am experiencing recurring kernel panics on an iMac 27". It won't even boot in safe mode. I tired to run Apple Hardware Test from the DVD but the test hangs after a few seconds. I removed the RAM cards from the iMac and installed them on a PC and ran a memory test with no problems. When the machine is cold it boots and runs for a few minutes (< 6 Minutes with heavy load). I was trying to monitor the CPU and other temperatures with a program and they all seem to be in the normal range: CPU core 1: 40 degrees, CPU core 2: 35 degrees, and northern bridge: 51 degrees. I am now out of ideas and would appreciate any helpful comments. Screenshot is attached.