I have the same problem with a shimano sora on a trek 1.2
The cable is not out of it fixed positions, it runs smooth if operated by hand, i lube it.
Can't figure it out.
There are several things that could be wrong. You could have thrown your chain (you couldn't ride at all if so). The bike could have been crashed and the derailleur bent. The cable might have slipped where it bolts to the derailleur. Or the cable or shifter could need maintenance, too. It is most likely one of the above. If it is only the adjustment, there are two stop screws on the derailleur that can be adjusted.
My best advice for you is to either find a bicycle repair manual at a local bookstore or your library that can show you some of the detail. Or just let your local bike shop do the repair.
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