RB750Gr3 is not working

hey everyone please help me
my router board is not working not showing in winbox or netinstall
1.hard reset is working
2. all ethernet port led is working connet to pc but its a not send or receive packet of data
please see the video of my problem


https://www.youtube.com/shorts/50L553ho-Dk

Hi
Try netinstall
https://help.mikrotik.com/docs/display/ROS/Netinstall
/Geir