BigRigTech
Diesel junky
I'd start looking at all the fuses under the hood and under the dash. Id also try a new CPS if you have one and ohm the wires from the CPS to the PCM. The OBS powerstrokes have a habit for chaffing the wiring harness on the drivers side valve cover so that would be something to check at as well. A scanner would really speed things up. You can also try unplugging the ICP sensor on the drivers side head to see if increased HUEI pressure fires it up.