A while ago I was working on my computer when out of the blue it restarts. I picked the -Start Windows Normally option. Before it even gets to the desktop it would restart all over again. It did this until I removed the RAM sticks from DIMM slots B (slot 3 and 4) Now my computer is really slow. My computer is a HP a250n with 4x 256 ram. A few days ago I did a full wipe on the HD to see if that would clear up the problem. It works well with only 2 sticks. When I put in the 3rd or/and 4th sticks I get to the desktop fine but only for a few minutes then it restarts and the screen goes blank. I tried switching the sticks but nothing works. What could it be?