I recently bought two Mac Pluses off eBay, one beige and one platinum. When I tried to boot them up, they both didn't work, at first. The beige one was booting up to a checkerboard screen, no startup bong, and made a buzzing noise. The platinum one booted up to a screen with horizontal lines, much like the terminal simasimac symptoms on an SE (also no startup bong). To try and narrow down the problem, I swapped the motherboards for the computers, and the symptoms swapped as well, so I knew that the problem was the motherboards. Cleaning the ram and rom chips had no effect. Finally, I swapped the rom chips between the two boards, and the beige mac (the one that had the platinum motherboard with the simasimac problem) started to work perfectly. Great! Now, I went to try and fix the platinum mac (with the checkerboard issue). I realized then that this mac had been upgraded to 4MB and the resistor had been cut. I started playing around with the locations of the ram chips and the amount I put in, but all I got were different shapes of checkerboards on the screen, and still no startup bong. Any ideas? I really want to get this Plus working!
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