[Cube] Wont startup

[Frank Napolitano]

I lent my cube to my stepdaughter a few months ago.A couple of days ago her roommate used the computer and she put a video game on top of the cube. I put in the PowerLogix PowerForce47 G4/1.5GHz processor before I lent here the cube. It has been running fine up until the video game "incident."  It does not start up all all now, only the fan runs. I am assuming it overheated and did some damage to something. I even took it to an Apple store and they also thought it was the processor. I tried putting the original processor back in, then another logic board. Other than the processor and logic board, is there anything else that it could be?