My iphone 5 keeps showing to connect to itunes but when i do nothing happens?

(keep in mind that it is still running on ios 7) I put ios 7 on my iphone 5 and yesterday i was downgrading to ios 6. When i was downgrading my phone would just be on that screen that is showing you to connect to itunes. I tried holding the power and home button for 10 seconds then letting go of the power and just holding the home button but nothing happened. When the screen goes completely black it still does nothing and my iphone doesn't even show up on itunes. I don't know what to do and i need my phone

Downgrade is not supported on iPhone

You need to get your device's UDID registered with a developer account as soon as possible. Apple has been disabling unregistered devices running unreleased software, but I registered my 4S on http://www.udid.in/ and I haven't had any problems with iOS 7.