Chosen Solution
Hey Andrew have you tried your computer with the disk that came with it? The reason I ask is because the Majority of times I get the error you are having on my clients computers I reinstall the system and that usually fixes the problem. I have also seen them fix themselves after running Apples Disk Utility.
First take out all the added RAM. Use only the original and make sure they’re in the proper paired slots. This diagnostic will most likely take some time and may be a matter of elimination.
I can suggest if you are willing to lift the procs up and re-grease (not arctic silver) after that tun your 258 ASD but go to calibration at the top and recalibrate the procs. if this does not work you more than likely have a bad processor CPU 1 which would be the second one.
