My 2008 Prius will not run. When I push the power button I get Master error light and check engine, abs, and others. Can only put the car in Neutral or Park. I was doing some body work; Light welding. I disconected the main ECU, removed the hv battery service plug and disconected the ground on the 12v battery. It feels like it needs some kind of a reboot. Does anyone know how to do this or what else could be wrong?