Original post by: Christopher ,
ok so, i hate being the one to admit this… but this happened to me before, but i caused it. Does the sound (sound) like its coming from where the fan is? Like maybe a mechanical screech? If so, its the fan hitting something inside. What i had to do was remove the casing (dont do this unless youre ok with voiding your warranty) and kind of bend the metal around it back into its original position.