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Can I use a 1GB stick of ram with a 512 stick in my Macbook or do they both have to be the same? Thanks in advance. P.S. The 1GB is from my old Powerbook G4, is it compatible.

I was running firefox and msn messenger and all of sudden everything froze up, I couldn't even move the cursor. I did a force shut down by holding down the power button and when I turned it back on the fan was louder than it's ever been and the screen was blank, I didn't even get the chime...