hangs while shutting down

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http://crunchbanglinux.org – a few days ago my computer started to hang when i was shutting it down. i would press super-x the click the shut-down button after doing this and putting in my backpack for transport. i realized that my computer was still on when i opened the lid the screen was totally blank when i pressed the power button again nothing happened. i tried pressing control-alt-delete and when i did that the splash screen appeared about half way done with it's travel of the black bar across the screen. when i then tried pressing the power button again nothing happened i waited for about 10 minutes to see if (HowTos)