If the back fan doesn't go, the filament will deform up the tube from the hotend and cause too much friction for it to go forward or backwards. I had this issue when I found out my back fan was never plugged in to begin with. (I always wondered how the machine was so quiet)
You can disconnect the bowden from the hot end side and take out the filament from there. The other folks may be of more help on wiring side.. It should be fixable though so don't panic!
There's also a few montreal/quebec people on here that may be able to help as a last resort. I think PM dude is one of them, and Voxel factory.
the broken and stuck filament thing happened to me just the other night. I broke off as much as I could, started a new print and fed more filament in from the spool as it was printing. the new feed pushes the old stuff through.
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