yes, i have to use the control panel to dim the screen. it's a Macintosh Classic I. yes, it has a fan, but it doesn't come in contact with the processor itself. instead, it's placed in the bottom below the Logic board.

Click to expand...

LOL, believe me, that fan is adequate to cool a 68000. Any heat it produces is whisked away by the currents inside the case. The 68000 is hardly a Intel Core Duo, crunching iTunes video codecs, it's not even a Pentium. The heat it puts off is likely even less than the heat the RAM puts off. Do you seriously think Apple would put a fan inside a computer if it didn't do anything? LOL. I have NEVER heard of ANY 68000 CPU failing in ANY compact Mac after 27 years of regular use, even those without a fan like the Plus. The CPU is the LEAST of your worries in that Classic, which is adequately cooled. And by the way, the Classic's PSU is robust enough to add two more fans inside blowing right on the CPU if that will give you peace-of-mind. The bigger problem you have with the Classic is that no matter what you do to keep it cool, the electrolytic capacitors used on it are ticking time bombs. They will almost all naturally degrade over the next 10 years if they haven't already. Apple used the cheapest materials they could to do the job and like all electronics the caps have a rated lifespan, which was not intended to be very long in the Classic as it was an antiquated machine when it was built. Forced obsolescence. Another fan will not change this.