How to open an asus laptop - a75v model?

I am currently trying to open my laptop so I can clean the processor/graphic card due to over heating. Though I took off all the screws off and no part seems to open... I tried looking on youtube but the models are different. Can someone please help me out?
 
Similar Asus models might help you even though they are slightly different. You probably have missed a screw hidden in the hard drive or memory/wifi bays...
 
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