Just had a complet system crash, had to reboot with power buton.

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https://bbs.archlinux.org – Dear all,Some days ago I had a random Xorg crash while I was reading my emails. It happend just once, I though it was nothing. A few minutes ago, monitor went black, sound stopped, num lock light freezed (pressing the button didnt turned it off), alt+printscr+{b,o} did nothing.How can I discover what caused this? I also see some problems with how the image in monitor is showed, here one example of the botton of the page "create new topic" in this forum: Some windows appears with repetitions when resized (I use awesome window manager). But I do not know if this is related to the crash (HowTos)