Hi, my laptop has been overheating alot and performance is suffering from that and from what i read it is most probably because i never cleaned or dusted the fan since i have the computer (3 years). I have seen videos on how to reach the fan on laptops but unlike all the models i have seen mine is still not uncovered when i remove just part of the bottom cover. So I tried to remove all of the screws from the whole bottom cover (not only the ones on the middle part) but it still wont open. I dont want to force anything so i dont brake it because it no longer has warranty, so i really need help on how to do it properly. I also read that spraying compressed air throught the exhaust grid only swirls the dust around and doesnt really get rid of it so to clean it as it should i have no other way than open the whole cover to reach the fan so i can spray it. Thanks in advance to anyone who can help me to solve this situation.