For some reason, if I boot ubuntu 12.10 64bit on 4GB of ram, it freezes exactly 5 seconds after log in. The only fix I could find was taking out a stick, leaving 2gb in. There Ubuntu worked fine. I know it isn't the ram, memtest gave it the clear multiple times for both 2GB sticks. Only way to get all 4GB's working was to update to the 3.7 or newer kernel. Is this a Kernel issue? Do I have remove a stick everytime I reload Ubuntu? Help please.