It's best you try charging for few hours as a first step. If that doesn't work press the power and home button at the same time for 30 seconds. It must restart. If step 2 does not work, connect your phone to laptop and try restore a back up. If step 3 doesn't help, try this Once you open up iTunes and phone page. Press alt and click restore it will open up a file chooser window , locate the .ipsw file normally be located in username/appData/….…/iTunes/iPhone software updates. Hope you will get iPhone out of recovery mode.
