i have a core i3 540 with 6 gb of ram (1*2gb , 1*4gb ) , i buy a new memory mustang ddr3 1333 , but it did not work , when i instal that new 4 gb only it remains black screen as there is no memory , i reinstal the old 4 gb and i change the d ram bios from auto to 1333 ( maximum ) same problem ...