Had an Odd Problem This Morning
It's a 2002 Z28 M6. Also, the battery looks to be the original AC Delco, and the voltage meter was reading normal when the car was on.
There's a fuse for the dash lights, if that fuse blows, the car won't start (I found that out the hard way...) If she gives you problems not starting, check that fuse, it's in the fuse box on the side of the dash.
The possible causes I'm thinking it could be are battery, loose/bad electrical connections someplace, or possibly something with the security system but I doubt it's security...

