Acer H5360 - Buzzing

[Hacksaw907]

So I just bought this projector as I've seen that it has good reviews and it seems to be one of the most cost-effective 3d projectors out there. However, whenever I turn it on, it makes a loud, sharp buzzing sound while it's running. The thing is still running fine, but the noise is really worrisome. I'm not sure if it's the fan or something, or if. Can anyone tell me what it is, and if I should be worried about it? Thanks.