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[ezjim]

I have a new HP pro 3500 with win.7 pro 64 bit operating sys. ,with one 2 gb ddr3 1333 pc3 10600 dimm.  I've tried to install a new additional 4gb dimm (samey samey) . It will not recognize the new dimm...Tried to install the new dimm by itself and no response at all...Sys. would not boot up at all....This is the second dimm  I've tried..Surelly  I didn't get two bad dimm  in a row..  Any input would help ..Thanks ezjim