Volume Issues

Last night I accidentally dropped my Macbook. Everything is working fine except the volume. If I use the keyboard volume keys, it just shows that it is muted and will not change. I tried to go into system preferences and change it there but it is showing that there are no internal speakers on the options (I read somewhere that that should be an option) Instead, it only has digital out. Is there any way I can fix the volume? Or should I take it into the Apple store. I know since it is dropped, this voids my warranty...

Sounds like something to do with the audio hardware/speakers may have been damaged from the fall..

I'd recommend visiting an Apple Store and having them check it out, that'd be your best bet.