I recently tried to upgrade a G4 running Mac OS X 10.2 from 64MB of RAM to 128MB. The SIMM I put into the G4 came from a Umax machine. It fit the slot okay, but now when I power up the computer it will not boot. Even after restoring the original SIMM alone it will not work. The power supply fan starts spinning and then shuts off. I realize I probably inserted an incorrect RAM type. Is there any way to repair this problem or did it do something permanent to the board?