I took my brand new Specialized Alibi out for a first ride today and rode on the middle chain ring for the entire ride until just before I quit, I selected the front up to the big gear and pedaled for a bit and then tried to go back to the middle gear but it's stuck on the big gear. I have the up and down trigger type gear selectors and when I use the down trigger it acts like it's not hooked to anything' just easily pivots but the front derailleur doesn't move. I don't feel anything when I put a finger on the FD cable either. Where should I look first? Thanks for any help!