I have a 2.4Ghz Intel Core 2 Duo Imac, 20 Inch. Bus Speed 800 mhz. I bought a 4 GB upgrade kit; 2 -2 GB 200 pin DDR2 SODIMM. I think I got the 800 mhz version. When I put both in and turn on the computer, it seems to go on (I can hear the fan) but the screen is black, and there no sound. When I replace one of the 2 GHz memory chips with a 1 MHz chip, it works fine, and the computer recognizes the 2 GHz chip. It doesn't seem to matter which chip I replace, or which slot I replace it in. But it doesn't work with both chips. Any thoughts? Thanks.
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