Jetson nano power and display problem

Greetings…
I have five jetson nano developer kit, following the instructions (https://developer.nvidia.com/embedded/learn/get-started-jetson-nano-devkit) steps
three kit work very well and another two kit have problems
First one power problem ( power led not blink )
second one display problem (i did’t see any display my monitor)
how can solve this problem
Thank you
Ranjith

Please share the serial console log for those two problematic devkit.

https://www.jetsonhacks.com/2019/04/19/jetson-nano-serial-console/