2007 pt cruiser turns but wont start

My 07 pt cruiser won't start .  has a 1 month old
battery. Original owner put a new Bluetooth deck in
it. Everything turns on, it "cranks " but won't turn
over. It stopped on me when I was stopped at a
corner. I was gonna turn but all the lights on the
dash came on and I could not get any response
stepping on the gas. I waited til the tow truck guy
came to get his input but he had no clue. Confident
it wasn't the battery because I just replaced it I said
f it since the driver is here I might as well get
jumped anyway. Well, it actually started and I went
home......but since I turned it off when I got home it
won't turn again. I hate being oblivious. I just don't
know cars