After upgrading my Dell Studio laptop with ATI graphics from 10.04 to 10.10 I get a low res boot logo (10.10 with four full stops under it) followed by a blank purple screen. I can log in "blind" and hear it load my desktop but the screen stays purple. I also can't see the command line if I hit Ctrl-shift-1 etc.
Any ideas how to fix this. I'm guessing it's an ATI graphics driver issue of some kind.