my laptop dv1000 fan!!

[hpdv1000]

please help guys my hp pavillion dv1000 fan is buzzing but the strange thing is on start up when i boot it up it blows air normaly and then when i start say playing a game and stuff it buzzes and dosent stop for a while im just wondering if its bearings im not willing to give to hp for 330 dollars and its warranty has expired i need to know how to take it apart i just dont understand it please help. thanks