Installed debian wheezy 7.1 with another PCI-E graphics card (nvidia quadro fx370) inserted. Now when I change to ASUS 6800GT (EN6800GT) with DVI-cable debian boots and show a rainbow colored swirl as background, everything else is blurred/grainy as well, see pic
Discovered when using DVI-> VGA adapter and VGA cable connected to monitor everything looks normal, and I don't mind using VGA.
However after entering login password and clicking applications tab system freezes (this happened with DVI as well). Only able to move mouse, nothing responds when clicking or when pressing any keyboard button.
Booted into recovery, gave password for root and tried
/sbin/lspci as instructed in stickied thread. I get "bash: /sbin/lspci: No such file or directory"
Newbie here - reply has to be at an appropriate level.
edit: when logging in as GNOME classic so far it looks good. *knock on wood*