How to fix Macbook Pro volume key?

Just randomly it stopped working today. The volume up button and mute buttons and every other key works, and I can manually turn the volume down, but the button wont work. Any idea how to fix this or know what went wrong?
nope, not preferences...any other ideas?

Recommended Reading

• cheap macbook
• Do I need an AC adapter to use my Macbook Pro in Europe?
• Should a software update crash my MacBook?
• How to connect two external monitors to MacBook Pro 13&?
• How to replace a Macbook hard drive?
• How much to fix my crashed MacBook Air?
• Can't find the MacBook you want? Search eBay now...

Tags: Mac, MacBook