Hi hope someone can help my car won't start last night I fitted my wind deflectors had the ignition turned so lights and radio was on I then noticed a little tapping sound inside the car and my interior lights flickered and I lost all power so I turned ignition off for a little bit thinking it was the battery then went to start her up and she wouldn't turn over so thought my battery was flat but I'm not sure if that is the problem as I've just tried again this morning my central locking, lights and radio are working but she still won't start up and when I turn the key in the ignition there's a noise from the engine as if she's trying to start up but can't get there can someone please help me

Thank you mark