chevy monte carlo 04 supercharger died while driving

one day after the car was running just fine, i
stopped at a stopsign, drove through then allbof a
sudden my car died. i tried to turn it over an all it
did was crank, i tried a few more times an still all it
did was crank...i checked the spark plugs and i was
getting no spark...before i was able to get it to a
computer i changed the crankshaft position sensor
and still nothing... a few days later a computer was
hooked up to it and it read codes p0496 and p0520
both codes were replaced today and still
nothing....plz someone anyone help