[CentOS] Memory vs. Display Card

Rick <ellis at 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)