I came back from college to discover the G4 Cube was plugged in, and would not start, with the PSU generating no heat. So wanted to know if you guys have any experience with repairing/replacing apple power supplies, Cubes have external PSUs and four pins, so I was thinking my options were to either to break it open and fix the problem, or to splice the wire into a new one. I looked at CubeOwner, but those guys seem awfully advanced for me to understand. What do you guys suggest?