Nano is not working

hi. I’m using Jetson Nano and I had used it pretty well until two months ago.
Today I bought a new power supply(5V 4A) so I tried to boot up Nano, but green power LED blink once and nothing happened. Of course I connect jumper to connect high power adapter.

And I tried low power micro USB power without jumper, but it does not working either.

+add) With sd card ejected, It doesn’t blink just lamp on. I suspect sd card part something went wrong… (but sd card is normal. I just format the sd card and reinstall os.

Resolved! I tried about 10 more time and just wait and tried one more time… It worked!!