Hi i cannot change the brightness on my late 2011 macbook pro.

Hi i cannot change the brightness on my late 2011 macbook pro. It is stuck on the lowest level in which i can't view the screen without a flash light. Please i need help how to solve this. I was on my computer when i checked the back which it was really dusty, i tried unscrewing the bottom however some screws were too tight so i took it upon myself and got a rod and startedremoving the dust off the vents and i may have clicked something as i closed the lid on the macbook i could hear the sounds still from the film but the lid was closed as i opened it back up the brightness was on low but sounds were still playing. All the buttons work , all of the F keys, apart from the brightnes keys. I can shine a tourch on the screen and see the display but the brightness will not change but i can see when i click the brightness it says it changes. I have connected it to a spare tv i have via hdmi and i really need help as this is my primary computer and i need it for work when going away. Thank you

Try SMC and PRAM resets:
http://support.apple.com/kb/ht3964
http://support.apple.com/kb/ht1379
Ciao.

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