Hey all- my 4 year old g5 Quad has started recently playing up. Today whilst working on Logic 7, the thing froze (which is unusual in itself) with a what looked like Terminal Text overlaid mentioning something about problems with CPU 2 and CPU3. It was a session playing back one drum loop and I was laying down a simple acoustic guitar riff with no effects or plugins being used. The sound card is a Digidesign pro Tools HD3 with a 96 io. I restarted the machine and of course the fans went nuts and the thing froze during boot up. Another restart and I had the OSX logo on a folder icon appear and after another restart it appears to be working. Last week it did something similar where it locked up but a restarted cured that. I replaced the HDD's about 6-7 months ago and upgraded the ram to 16GB. It has very occasionally displayed strange behaviour but since nothing has been changed or updated in a long while. The machine has been so reliable that it is quite noticeable when it suddenly stops like that. Any ideas? I had hoped to keep this machine at least until the 2010 MP's come out.