2000 devil no dash or head lights nor will it crank at all

Battery is dead. Have someone give you a jump start and then replace the battery.

lot of the time it`s loose or broken ground wires check them

Yes check the ground wire from the engine to the frame. This wire is located on the right hand side of the engine, just below the PCM and the A/C Condenser.

Is my pcm bad if i got no power

Where does the ground wire attach to the frame and engine