First try reseating the memory. Sometimes memory dimms not fully seated will not register. If that doesnt work are you sure that you ordered/bought the correct memory for your unit. Some units require PARITY.. meaning that two different memory manufacturers may not be compatible in machine and you need two memory chips from same manufacturer and model and size.So if you have one from one company and one from the other the machine may be only recognizing one of them. If you have done both of the above.. Remove all memory and boot machine. Allow to do a full boot to OS and then shut down the unit via the OS... Start, Shutdown. Then reseat memory chips and reboot. Always do this with battery removed and on AC power.
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