My daughter has an '03 Impala. The TPMS has been indicating 'low tire pressure' since she got it. Today she tried to reset the system using the light switch method. I wasn't there but apparently there was a clunk, then the car died. Now she's getting nothing at all. When she turns the key the gauges go haywire but it acts like a dead battery. I'm thinking something to do with the anti-theft system. Tried disconnecting battery then trying again but it didn't work. Any suggestions?