Ubuntu amd64 freezes randomly

[Daniel]

Hello, I have a very strange problem regarding my ubuntu laptop. Randomly it
freezes and by this I mean everything freezes, sound, video, mouse cursor. I
am not able to do anything(any key combinations, anything). Why is this
happening, how can I debug it and fix this problem? I'm running ubuntu amd64
on my dell inspiron 1545.

Thank you in advance for your help.
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