I upgraded to Ubuntu 12.04 from 11.10 (32-bit). Now when I boot my machine it hangs on the Ubuntu screen (with the loading dots below the word Ubuntu on a purple background). Nothing I do (ignoring the power and CD drawer buttons) gets any reaction.
I've tried booting to a live CD of 12.04, with the same result I know that the cd is OK because I tested the CD on another machine.
nVIDIA Graphics card
3.2GHz Intel CPU
I've tried using 64-bit and 32-bit versions of 12.04, with the same result. I'm now using a live-CD of Puppy on my computer (so I can boot live CDs, just not Ubuntu 12.04)
Any help would be appreciated.