Laptop heatsink fan won't spin

[DeadxSoul]

Hello, so i have an asus u41s with already 2 years old and the problem started like 2 days ago.
When i boot my computer the fan isn't spinning at all and after like 10 minutes it starts to spinning and before it was always spinning from the beginning until the end. This isn't what i am more concerned about, I'm more concerned because now the cpu fan only works between 500 rpm and 2000 rpm even when temps hit 90 degrees and before the cpu could reach 4000 rpm. I just can't play anymore, what do you guys think it can be causing this issue?

 

[Laptop_Nerd]

I would clean the laptops inside first and if the same problem persist the fan needs replacement already since it might have been faulty or damaged already due to it's age. You may actually refer to some website step by step instruction on how to do this.