I have a 2001 GP GTP with 160k on the clock. Never had a problem with it until now. I was driving the car and the info center started to flash 0.0 on everything. (MPG, Oil life, Fuel used, ect.) But it still ran fine. I drove it for about another 10 miles and shut it off. About 15 min. later i come back and go to start the car. It turns over just wont start. And NOTHING electrical works. (headlights, brake lights, interior lights, cig lighter, ect.) But the car will turn over all day long. When you turn the key to on the only lights that light up are the red oil can light and the red battery light. No service engine soon, nothing. And the key will not turn backwards to go into accessory and the key is stuck in the ignition. There is no power getting to the interior fuse box. A mechanic told me that he thinks my ECM went out. Any second opinions?

PLEASE HELP