This question already has an answer here:
I am a long term but ICT challenged ubuntu user. My stable desktop crashed a few weeks ago while i was on the interweb and ever since boots to black screen with clayton@clayton-desktop:~$ and a non-blinking cursor in the top left corner. How do I get ubuntu and my files back? Currently running 12.04 (from memory, or maybe 12.10). Any help would be appreciated
P.S. i have looked through many of the FAQ's without any joy including the ones suggested here which seem to be off topic as they relate to installs not functioning systems.