APPS SHUTTING DOWN, BLACKS OUT, RECENTLY FELL AND HAS THE SCREEN UNEVEN

i got my g4 a year ago. recently i dropped it as i tripped on the stairs and now the screen is a tiny bit uneven with the keyboard area. also, i was told m startup disc was nearly full so i deleted many items or apps i didn't think i needed. anyways, it has recently been shuting down apps such as iphoto, aim is a big one, and many more. just last night i had finished working on a paper and went downstairs to eat. when i came back my screen was black and would not move. not one button would work-the audio acknowledging a button was pressed didnt even beep. i tried to press the power button multiple times but it did not work.
i decided to leave it over night in hopes that it would reset itself or something. it did not. i had to restart it which is terrible for me since i did not have the chance to save my paper.
why is all of this happening? is there anyway possible to get my paper back?
a little more info:
i never shut it off-always just put it to sleep
i use appleworks for my papers
apple has done NOTHING to help me with my probs whenever i send them "what i was doing when the problem occured"
what is the best way to deal with this?
g4   Mac OS X (10.4.8)  

it just sorta started working again

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