Question when i turn the refresh rate to 120 hz the screen turns off. my monitor supports 144 hz and my graphic card is gtx 1660 super

[braveson92]

when i turn the refresh rate to 120 hz the screen turns off. my monitor supports 144 hz and my graphic card is gtx 1660 super. i am connecting the monitor to the graphics card via display port cable.

 

[sizzling]

What exact monitor? Sounds like 120Hz is not supported which would be odd.