I recently acquired a nice example of a Mac Color Classic, well cosmetically anyway. When I turn on the power switch I hear what sounds like the power supply and the screen powering up, but the fan never gets going and nothing else happens. I have tried attaching 3 different ADB keyboards to no avail. The funny thing is that if I remove the logic board and power the system on the fan starts up! The logic board has NOTHING installed in any of the exansion slots. No RAM or VRAM. Could this be the problem? I thought CCs had soldered in RAM and VRAM. Do I need to fill these slots for it to work? Any other ideas?