RodiZio

Hi everyone, I just did head gaskets on my 350z and when I was all finished I tried to start it but the motor wouldn't fire. To make a long story short I'm not getting any spark. I've tested the crank position and camshaft position sensors and all seem to be good. Also the coils are getting 12volts and are receiving signal to spark but nothing. Is it possible for all six coils to go bad at the same time? If anyone has any input on this please let me know. Thanks