Jetson does not start-up

Yesterday there was no problem at all. Jetson was working very good but today it does not start. The green light is on. The usb ports of nano are not working. I dont have a screen to see what is going on at start-up.

It gets more weird. Sometimes it works just fine sometimes it does not. I change nothing so what is wrong?

Just want to let you know … there is an alternative method to dump log and check from host.

We always use this method to check log when no monitor or usb broken case.
If you need our help, please dump the log and share it here.