Dell u2413 screen blacks out

Hi,

My Dell u2413's screen just goes black after a 2 or 3 minutes sometimes less. I have owned it from new and its in perfect condition, not a scratch on it, just this problem.

The power button's light stays on though so I know the screen is not totally turning off. If I press the menu button it doesnt display so I know its not just the video signal from the computer at fault. If I turn it on and off the screen reappears. This only started happening when I got my new Mac Studio. I dont know if the video signal from the Mac Studio via HDMI or USB-C outputs is to high rez or if its got nothing to do with that?

Given the fact that the power button stays on and doesnt turn off could the cause of the black screen be somewhere else and not on the internal power circuit board?

Any thoughts would be greatly appreciated! ;-)