@tao13, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with your project 
See About the Installation & Troubleshooting category.
The minimum requirement for the barrel jack is 7V (absolute minimu 6V) , not 5V.
If you want to power the board with 5V, use a cell phone charger and USB or connect the 5V to the 5V pin. In the latter case, you have to disconnect it before connecting to a PC using USB.