Hi, I'm Randy. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
This could be a glitch in the software and the iPhone needs to reboot, lets try and force a reboot > Hold the home button and the power button down for about 60 seconds or until the Apple logo appears on the screen, then release both buttons. If it does not power on release the buttons after 60 seconds and then hold the power/sleep button only for 60 seconds then try holding both buttons again. Repeat the process a few times and then if it does not power on you will need to use your computer to restore the iPhone. Please follow these steps,