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How to reboot a galaxy s3
Press and hold the power button located on the right-hand side of your galaxy s3.
Select " power off.
Select " ok " when informed that your selection will power off your device.

Available options: [+] Your phone may take several seconds to turn completely off. Press and hold down the power button until the phone reboots and powers on.. [+] Confirm that the power switch is to the off position. Disconnect your device from the console and then push and hold the power button while continuing to tap the power button located on the right side of your device.. [+] Press and hold the power button located on the right-hand side of your galaxy s3 using both hands to turn off the power option. Your samsung galaxy s3 should now be powered off and ready to reboot.. [+] Press and hold the power button while continuing to hold the power button until you hear a beep. This signifies that your device is fully reboot and that it's ready to be returned to the start menu..
Answer:
Your phone may take several seconds to turn completely off. Press and hold down the power button until the phone reboots and powers on.