Possible Duplicate:
My computer boots to a black screen, what options do I have to fix it?
Hey guys, I was using my Ubuntu 12.04 and today I had a problem:
I was running virtual box, photoshop and doing some updates, when ubuntu "explorer" went missing. The top and bottom bars disappeared too.
The only thing that remained was the "explorer" window, I couldn't press ALT+TAB to change programs, seemed like the "explorer" was frozen.
I tryied rebooting the system manually, but when I turned it on again, after the classic purple screen with the dots, the screen went back, neither my keyboard nor my mouse work.
Already tryed ubuntu 12 LiveCD, boot-repair and recommended repais, but the problem persists.
So, anyone can give me a hint of what happened or how can I fix this problem?