No, Remove the stick you have in the system now and swap it with the other one. You will boot it with just the one stick to see if that stick boots up too. Once you are sure that second stick works on its own then you should do BIOS F7 then power down and add the second stick of memory. Power back up and see if it now sees both sticks? Note: After you've added that second stick of memory back in confirm what slots the two sticks are residing in?I see i'm at F5, so can i try now and install the second RAM?
It's only working with one slot used, as soon as i add the second one it's error 55.No, Remove the stick you have in the system now and swap it with the other one. You will boot it with just the one stick to see if that stick boots up too. Once you are sure that second stick works on its own then you should do BIOS F7 then power down and add the second stick of memory. Power back up and see if it now sees both sticks? Note: After you've added that second stick of memory back in confirm what slots the two sticks are residing in?