Laptop makes whistle noise

[SlyNexus]

Hello I have a ASUS K55VJ laptop which is overheating when playing games and the laptop is always making a high pitch whistling sound. The sound is always there and its like a twiching signal noise. I know that the fan is working and its not making the noise. It is a 1 month old laptop.
i7 3630QM 2.4 GHz
nVidia GeForce GT 635M 2GB
6 GB of RAM

The sad part is, I dropped it.
Could it be the CPU that is making the sound?
And should i take it to warranty service hoping that there is no seeming damadge, that indicates that i dropped the laptop?

 

[clutchc]

Since you dropped it, I would suspect a crack in the case or inner ductwork that is causing the whistle.