I have a setup with an ASRock H110M-ITX/ac, Intel Pentium G4500,  https://tweakers.net/pricewatch/415205/crucial-ct8g4dfd8213.html" rel="nofollow - Crucial CT8G4DFD8213  and  https://tweakers.net/pricewatch/525475/crucial-mx300-2-komma-5-inch-525gb.html" rel="nofollow - Crucial MX300 2,5" 525GB .

Running both Windows 10 and Zorin OS (Linux). In combination with this I use a Dell P2415Q Rev 4.

When I boot up the PC I almost always get a black Powersave mode screen. This occurs
when connected via HDMI or DVI to DP. 

Sometimes I can boot up if I disconnect the screen and hdmi and empty the cache of the monitor by pressing the power button.

Connect the monitor via mini display port to my work laptop gives no issues. To my tv via HDMI no issue.

The problem is that Video Oprom is always on legacy mode in BIOS. Even when changing it to UEFI, it always automatically reverts itself. I also enabled the following: BIOS > Advanced > Chipset Configuration > Deep Sleep > Enabled in S4/S5

ASRock already gave me a BIOS update with UEFI mode enabled but it makes no difference.

Finally a factory reset of the monitor makes no difference.

I tried updating the BIOS > latest version and the drivers via BIOS but it just froze when doing that.

Anyone an idea what else I can do? 

Thanks