HDMI Monitor says 'Signal out of range"

[DRONE7]

What happens if you....?

Code:

sudo nano /boot/config.txt

and add

Code:

hdmi_safe=1

and reboot ....

There are plenty of options for configuration if you know the parameters of your monitor/s
https://www.raspberrypi.org/documentatio...t/video.md

What make and model monitors are you using ?