i got one pc to repair.. i tested all hardware .. and all are working normal..old equipament then only works windows xp.. so all working fine.. all drivers updated.. chrome browsing clean sites etc just fine.. then if u open facebook, youtube etc simply freeze the damm pc.. i suspect the dimm memory ram is not working right.. only left dimm works the right does not recognize and of course cleaned with eraser and I put another memory .. same damm problem.. I put a video card.. I got another source and.. same problem.. please anyone can help me?