Rick ellis@spinics.net writes:
Since memory has become quite cheap lately I decided to move from 2 GB to 6. When I installed the memory every thing was fine until I went to run level 5. At that point the screen turned to garbage and the system froze. Is there a way to fix this so I can use the memory I bought? Do I need a new display card?
Have you tried memtest86?
without a serial console, it'd be hard to see if that's the problem, but it is a good place to start.
Often if you have bad memory the problem doesn't show until you use something that actually uses more of your memory (like starting the GUI)