[ubuntu] Laptop suddenly crashes for no reason (12.04)

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http://ubuntuforums.org – When I turned on my laptop today and clicked on a program, it suddenly crashed for no apparent reason to me. The screen turned to black and showed commands. I restarted my laptop and turned it on again and somehow I managed to use a program for a few minutes before an Ubuntu message saying something like 'you have system errors. report it?' to which I clicked on the report button but after a few minutes the screen turned to black with commands again. I really have no idea how this happened since yesterday it was working fine. I've uploaded some photos of the black screen although it (Hardware)