My macbook air is not booting after installin windows 7 32 bit via boot camp.. when ever i try to turn it on, the screen starts like it is gonna work but suddendly it turns dark ?!?!

I recently had to install windows on my macbook air, so installed windows 7 using boot camp.. The installation went great and that entire day i was workin on windows on my macbook.. Althogth the next day my macbook air refused to work when i turned it on showing only a glimpse of starting screen.. What did i do wrong?!?! How to solve this issue. My book air is only 3 months old and worked perfectly before installing windows.. Any help would be appreciated.. Thank you..

check and make sure your screen brightness is up - (fn F6)

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