This is on Ubuntu 10.10 Desktop Edition 64-bit.
Yesterday I installed kubuntu-desktop to give it a a try. I liked it, but decided to uninstall it. I followed these instructions: http://www.psychocats.net/ubuntu/puregnome
It all went smoothly until I restarted. Now, after the splash screen (which changed back to the default one instead of the one I had before, which was caused by installing ATI drivers), the screen goes black and nothing happens. I tried a verbose boot but the text output stops at this point. The strange thing is, though, that LiveUSBs do not work either. I tried two, one that just remains on the splash screen and another that gets a black screen after boot. These LiveUSBs do work, I have tried them on different machines and on this computer in the past. Recovery mode works, as does booting my Windows 7 partition.
Any help would be greatly appreciated!