Security light came on and now won't start. on 2001 Cadillac Seville STS

I was pulling into house and security light came on. I turned the car off and then tried to start it again. Nothing happened it is as though I was locked out. Nothing works now key faub won't even work.

1 answer
Here is some info about this problem: http://repairpal.com/gm-passlock-security-light-issues