My G5 is running on OS X 10.2.7, duel processors, & 2GHz. I have always had trouble starting up my machine; I start it, but nothing happens on the screen, so I turn it off and start it again, 3-5 times until the screen comes on. I took it to the mac specialist and they couldn't figure it out. They said it was probably compatibility issues with the cheap-o screen I bought. Also when I put it to sleep over night it won't wake up, I have to restart it again, and when the room is cold G5 has a harder time starting up. Now there is a new problem. When it finally starts, the usual apple logo appears on screen as it boots, but when its done all that comes up is a completely blue screen. I can see and move the mouse pointer, but nothing else. No icons, no dock, no menu bar, nothing just blue. The tower makes a quiet, high pitch "bzzz...bzzz...bzzz" sound that I haven't heard until now. The sound comes from below the "On" button, the area I don't have access to at the bottom of the tower. I think it might be a short. What do you think?