Thread: Pontiac Not starting

I apologize ahead of time If I have posted in the wrong section, But Im hoping That I can get an answer with My girlfriends Pontiac. Yesterday after work she had drove her car to the store and when she got back inside her 99 Pontiac grand prix would not start. We got her a new battery and put it in and it started up and we drove home. somehow over night something went wrong once again and this morning when she started her car it simply would not start. She says the dome lights came on and everything was working until she turned the key and everything shut off. with the key in the on position Nothing will come on. I disconnected the positive on the battery for 15 minutes and then reconnected it, and put the key in the on position and the dome lights came on and everything was working just fine until I go to start her car and everything shuts off and again nothing will work with the key in the off position. Im hoping someone might have an idea as to whats going on as Im not much for pontiac nor have alot of knowledge.

I have checked the battery with a volt meter and the battery is good. When you turn the key to any position, either on or to start the car, there is no power anywhere. I cant even turn on the headlights or overhead lights. not even the fuel pump turns before starting it. Ive been told that it could be the ECM is fried. I am handy and willing to work on the car I just have more knowledge of chevy and toyota cause thats all ive ever owned. Ive also checked all the grounds to the battery and they are all nice and tight and corrosion free. I appreciate your guys help. thank you

Billboost you are correct, everything you have mentioned works just like that. as for any work being done, it gets complicating. My girlfriend only trusts her brother since he is "Certified" mechanic, yet I have had to redo the brakes and brake lines he messed up, but now she is tired of him messing up so she finally asked me seeming how everything i've done for my trucks have been working and standing strong. the battery connections and terminals are corrosion free. most connections that I have followed are nice and tight but I know I haven't checked all of them And I will check the grounds on the bell housing and let you all know later on. Thanks

You guys are awesome. It was a loose ground above the starter. Car started right up and came back to life. took it for test drive and turned everything on and drove it home then shut it off and it started right back up minutes later. Thank you all for your help