No display on Nvidia Jetson NX30D monitor

My Nvidia Jetson NX30D card won’t boot even though all the institutions are complete. More precisely, there is no image on the monitor. I did the installation 1 month ago and everything was perfect. Now when I plug it back in, the PWR led is on, the fan is running, but there is no image on the screen.

Hi,

What is this NX30D?
You should ask the board vendor for help as it looks like some kind of custom carrier boards.