Performa 630CD:Freezes At Start Up Due To Wrong SIMM Type (8/95)

I have a Macintosh Performa 636CD computer. Since I installed a RAM upgrade, the machine boots to a frozen gray screen. I put the same kind of double banked SIMMs in both slots. What is wrong?

The second SIMM socket can only accept single banked SIMMs, that is, 1MB, 4 MB, and 16 MB. You cannot use double banked SIMMs in the second slot. You can only use double banked SIMMs in the first slot. To fix the problem remove the double banked SIMM from the second slot and restart the computer.


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Published Date: Feb 19, 2012