This all started last week when I went to start my lac and it wouldn't start. I was pissed and left it alone for a couple days and drove my moms car. Then yesterday I was wanting to go to my girls house but didn't want to drive moms car I tried to start my and it started right up. I got to my girls house and a couple hours later tried to go home and it won't start. I don't think it was the battery because the interior light were on. I'm thinkin alternator or starter