We just bought an 05 cobalt for my son to drive. Key fob has never worked so just had to lock/unlock doors with key. My wife used the car the other day and locked the car using the electronic switch on the door which set the alarm. Not knowing that the fob was dead or that she could just put the key in the ignition, she set the alarm off. They fiddled with the fob forever until the alarm finally just went off but now car will not start. We’ve done EVERY reset trick in the book and nothing. The security light is not on but if you lock the doors it blinks really fast but does not set the alarm off if you open the door. I’ve searched and searched for an answer and nothing. Thank you in advance for any suggestions before I set this thing on fire!