Mega 2560 keeps resetting

My project is working when I am plugged into the PC and outlet power. When I unplug the PC so it can run stand alone it keeps resetting; Setup keeps looping.

I'm running a mega with 2 TTL camera, Color Sensor, Lux Sensor, Relay Switch, Temp/Hum sensor, UV Sensor and Data logging shield. The Sensors and Camera are all logging to the SD on the data logger. I do not have any interaction code with the PC.

Any ideas or pointers why it would keep resetting when disconnected from the PC.

Sounds like the power supply is inadequate.

...R