This may happen after you entered too many times' wrong passcode. It asks you to connect to iTunes is actually let you put your iPod into recovery mode. In this case, if you follow the traditional methods to hold home and power button, it will be impossible to enter recovery mode. So you have to force it into recovery mode.
iTunes error 1015 is always along with the "plug into iTunes" screen stuck on iPhone. Indeed, that is the common error "iPhone stuck on recovery mode". Easy and quick way to fix it is to use the ReiBoot. Have a try by following this guide: How to exit iPhone recovery mode easily and quickly.
Check whether the Ring/Silent switch on exterior of iPhone 5 is switched to silent mode. This is a common factor causing iPhone 5 no sound and many of you may miss it. Flick the other way to the Ring mode in this case. If this tip can't help you, I believe you must can find the fix you from this article iPhone 5 Speaker Not Working – Top 10 Options to Fix It