2000 Pontiac Bonneville

I drove car this morning to work it was fine, came right out 5 min later after parking tired to start, got nothing, no crank, no engine noise nothing. U turn the key and its silent it does nothing, car has full power, pressure tested and low fuel pressure, replaced fuel pump, and still nothing, what should I look for next? I also put some intake cleaner in the throttle body and the car started and ran on that for a min or so then died, that was before I replaced the fuel pump, u can hear the fuel pump turn on, then turn off, please help me!

thanks!