External monitor says "Input Signal Out of Range" Helios 300 G3-571

Hello,
I have been trying to connect my Predator Helios 300 G3-571 to an old monitor (AG neovo F-419) and it shows me an error "Input Signal out of Range".
I have searched online for solutions and I found that the problem is the resolution. By default my laptop is sending 1920 x 1080, 60 Hz resolution which is too much for the screen. The correct settings for the monitor should be 1024 x 768, 60Hz.
When I try to change that it gives me two errors:
1st. "The display control panel is unable to change the display settings. You may not have appropriate administrative rights to change these settings."
2nd. "The display settings being saved are invalid. Please try a different combination of display settings."
I have also tried running my laptop on safe mode, but when I run it on safe mode my laptop does not recognize the monitor.
And I have also called the company to help me with their screen but they can't do anything.

Can anybody help?