Solved! a456u fan sound loud

Solution
It is probably a fan in the laptop. If it is getting louder, it is possible the fan is having problems. If you can open the laptop up (as long as it isn't under warranty) then I would suggest opening it up and cleaning out any dust and debris. Should that not be enough to resolve the problem, then you may have to replace the fan. You can either try doing these yourself, should you feel comfortable doing so, or if not, try taking it to a local tech.

Now if it is under warranty, don't do anything yourself and contact the manufacturer.
It is probably a fan in the laptop. If it is getting louder, it is possible the fan is having problems. If you can open the laptop up (as long as it isn't under warranty) then I would suggest opening it up and cleaning out any dust and debris. Should that not be enough to resolve the problem, then you may have to replace the fan. You can either try doing these yourself, should you feel comfortable doing so, or if not, try taking it to a local tech.

Now if it is under warranty, don't do anything yourself and contact the manufacturer.
 
Solution