I replaced the 4 ignition coils and plugs gapped .028 on my 2004 a4 Quattro It started once and drove fine next day it would not start. What could be wrong? Cranking but won't turn over

 

Scan it for codes. Something else died most likely. If the crank sensor or cam sensor went, either failure will prevent the car from starting. There are other possibilities of course but those are two you can start with.