2000 Chrysler Concorde No Start

Electrical problem
2000 Chrysler Concorde Automatic 151500 miles

I have a 2000 chrysler concorde lxi - The car has a check engine light on. Recently I would be driving and the car when I would put on the breaks would cut all the electrical gages off, lights would flicker and than all the electrical gauges and lights would go back on once I would start driving. Today, the car started fine in the morning - I came out from work and the lights were on, alarm workedbut as soon as I would go to try and start - No start. Putting the car in on position everything would shut off all lights, gauges and no horn. Please tell me what the problem could be - thankyou very much.