Ok, ive always ran 3 sticks of ram in my pc ,a 2gb,and two 1gb sticks, however, recently ive only been running two because ive been running 32bit windows(one in first slot and one in third slot) I went to put the other stick back in and now the pc wont come up on screen whenever a stick of ram is insterted into the second slot, ive also tried all different types of combinations but even with the sticks in different slots i cant get the pc running with 3 sticks in, any ideas? ive allready tried resseting the cmos , help? 
