i need to replace my laptop case and the monitor caseing because i droped my laptop and bits broke off and cracks have formed, iv tried to open it befor, i got all the screws out that i could see but its like there was screws in the middle stopping it from opening, i had taken the dvd drive out aswell so there were non under there, do i have to take the keyboard off, and if so,how do i do that because if tried befor when i needed to clean it, but i wasnt sure how, i pulled on some metal tabs but it seem like it was going to brake, so im not sure what to do