Paul, sorry but I need more help.
I bought 2 sticks of Crucial4 gb P?N ct51272ba1067 or web page http://www.crucial.com/usa/en/ct51272ba1067
Put one in black slot and got the 5 warning beeps and no start. Then I put the other in slot three thinking I am following the protocall and still got the wrning beeps. I removed the new 4 gb sticks, reinserted the old samsung 2 gb stick and the machine runs fines.
Any additional comments will be appreciated. Thank you,