I have a two week old PowerMac Dual 2.7 GHz G5. It is running OS 10.4.1 with all other software updates. Today, while I was capturing some video with Final Cut Pro HD my monitors suddenly went black and the computer would not respond. I had to hold the power button to shut down. I booted back up and tried to capture again with the same result. I turned off and unpluged the computer and waited about one hour. I booted into Tiger and let it sit for a while to see if it happened again and it did not. I then started to put together a iPhoto slidshow for work. I got the slideshow finished and then went to export it to iDVD. While exporting the screens went black again and I needed to hold the power button down again. This time the computer would not boot. The light is lit on the tower but there is no image on my monitors and no power to my mouse or keyboard. There was no start up chime either. I uplugged all devices from the computer (except mouse and keyboard) with no luck. The computer will still not boot. I then removed the USB2 and FireWire card's I installed but the computer would still not boot. I have now removed the 2GB's of RAM I bought from Crucial. So all that is in the computer now is what came with it. Please note that all of the hardware I added has been working for the past week and a half. What should I do. Is there anything I can do before calling Apple?