My friend has a dell dimension 4550 with a P4 2.53 GHz processor and 256 mb of PC 2700 ram and I bought a 512 mb stick of Kingston PC 2700 ram. I installed it in the second slot turned on the computer and it didn?t recognize the stick of 512mb ram. Then I took out the stick of 256 and just put in the stick of 512 and it failed POST. I tried putting the ram the slots in all combinations. I don?t know why it?s not working? Faulty Memory? Incompatibility? Any answers would be much appreciated.
