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JessMaccy

macrumors newbie
Original poster
Hi all, yes it's Christmas Day and I'm installing some RAM for my mac. I recently got 2 x 2GB 200-pin DDR2 SO-DIMM PC2 - 6400 CL6 RAM. When I install it and turn it on, it boots up and makes the whirs like it should, however I just get a black screen and nothing comes up. Any help would be greatly appreciated.
 
Yes I've tried reseating several times and it doesnt make a difference. I tried the old ones and it boots fine. I haven't muddled them up i've made sure by checking the labels. Can it be something to do with the memory frequency? My iMac runs at 667MHz and the ones i just bought run at 800 i think :/
 
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