Need some help troubleshooting my work G5. Came in this morning and it had kernel panicked. Stupidly I didn't look at the error before I rebooted it because it's done this before and so I didn't perceive a problem. That is until I restarted it. This is a 1.8Ghz G5, single processor with 4GB of ram, late 2004. PowerMac9,1, M9555LL/A. It powers on, if I hold down the OPTN key it recognizes the drives. However, it will NOT boot. It goes as far as displaying the dark gray apple logo. No spinning gear, nothing. The same with any boot disk in the drive. If it's left off for a while when you press the power button you get a static crackle sound for a minute or so then it kicks on and fails to boot. I suspect that it's probably the hard drive controller, but I don't have a lot of experience with this. I do have the original hardward test disk but if it won't boot from the DVD drive I don't know. That disk is still at work so I can't try it yet. Ultimately, I believe that the logic board is probably toast. If anyone has any other ideas or thoughts, I'm open. Otherwise I will be off to eBay in about a week. For all intents and purposes this is a dead Mac where work is concerned so my boss let me have it. It's going to be replaced by an Intel Mac. If it is the logic board, is it possible to replace it with one from a faster model, perhaps a dual or so? All of the other parts work fine. Thanks in advance!