You two may have different cases but the debug method is the same.
Please dump the uart serial console log. Before dumping this log, remove the “quiet” keyword inside /boot/extlinux/extlinux.conf on your sdcard image rootfs.
https://elinux.org/Jetson/General_debug
For @nisar.bukhari, I would suggest you could also try other monitor too.
And for @kozinov.andrey, please make sure you are using 2GB sdcard image but not Nano-4GB sdcard image.