Hi,thank you for the reply,I was indeed following those pages in populating the rams,they are two 4 GB rams, each works fine when I tried them individually at slot one (Black) but when I tried both one in slot 1 (Black) and one in slot 3 (Black) the error message appears 201 on booting, now I decided to test them again each in slot one (Black) both make error message 201 when installed individually in slot one (black), so I assume either has become changed when installed together or made changes in the system, both are new and under warranty.
I previuosly spoke to Crucial technical support as they are placed in town near me,I have tried one of their rams which is Crucial micron, but it also produces this error message 201 when I used the DDR3 PC12800, they do not stock the DDR3 PC1333.
I appreciate your further help.
Thank you.