have you tried this , put the 2xpc2100 speed modules in to the first 2 mem slots and the pc2700 into the 3rd slot - youve got slower modules and a faster 1 - if you put the slower ones in first then the mobo will throttle down the speed of the faster 1 to that of the slower ones, which is ok, but if youve got the faster 1 in the first slot then the whole thing will fall over as it trys to make the slow ram run faster.
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