Black screen after Window logo

hey im new and my laptop is having big problems after i let my friend borrow it for a month. when i got the laptop back from him i noticed that the screen wasnnt in the right resolution, it was to small. so i changed it. right after that the colours were all screwed up so i decided to restart the computer. but the screen just goes black after the window logo loads. i hear the window music but its just a black screen. the safe mode and everything else doesnt work. please help..... its a sony vaio pcg-r505el running windows xp home
 
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