I'm running 64-bit Hardy with an nvidia graphics card. Everything was going fine. However I am now stuck in low graphics mode. Yesterday, I changed two things in my system. First, I configured a second monitor and that seemed to work fine. After that I went to Synaptic and downloaded a bunch of video editing stuff, Avidemux, Ubuntu Studio/Audio/Graphics, etc. It said it would take 10 or so hours, and I couldn't leave the computer on, so I had to stop the installation after a few hours. I don't know where it went wrong, but when I turned the computer on this morning, it said it couldn't find my graphics card and put me in low graphics mode. Any ideas??