Last night my 2011 Buick Regal refused to start after having just been driven. It will attempt to turn over, but never quite manages even that. All of the other electronics turn on and function and it didnt take a jump start. The battery is getting on in age, so its probably not a bad place to start but the battery warning light isnt on. If that doesnt do the trick anyone have any ideas on what it could be? The easy route would be to plug in an OBD II scanner but I dont have one of those at the moment.