Lenovo laptop making buzzing sound bottom left

My laptop is making a buzzing sound on the bottom left. It's a lenovo. Is this normal? Runs on windows 7.
Edit: I found out it's the cooling fan. Should I be worried?

I found out the real problem. My speaker on my laptop which is located on the bottom left of the back is buzzing unless it's on a table. What could this mean?
I managed to find a switch on the back next to the speaker which made buzz less to the point where it will only buzzes if it isn't on a table. Should I be worried?

 

Put something on the speaker. That should help. There's probably a loose screw, which keeps it from staying tightly to the computer.

Maybe if you tape it down, it will stop it temporarily before you get it fixed.

Good luck.

 

Thanks. I reformated my harddrive and it fixed the problem.

 

Glad to hear you got it sorted out.

Problem solved, topic locked.