Put the key in my 2005 elantra and the key turned but instead of starting all I got was a flapping sound then a sort of soft grinding. The check engine, oil and battery lights were on. Oil and battery should not be the problem. Could this be a belt? Was told a few months back my ac belt (?) Needed replaced but was told that it would not affect car operation just ac/heat. Other belts supposedly were okay when I asked about them.