Can an injector fail completely??

I have a cylinder not working (no1)
This is an N/A engine, symptons were intermitant misfire with fault code read as No1 cylinder missfire.

I have swapped coil packs and plugs and still the fault stays with no1.
When i unplug the injector plug on no1 there is no difference in engine rpm.If however you unplug any of the other injectors the difference is obvious.I've checked for 'power' at the injectors and all give a reading of 14v.Any ideas??