Hello

I saw the following post that is similar to my issue. Only difference is I have no warranty and would like to fix it myself. The issue I have is I replaced the main board 715G6862-M1A-000-0H5K with another as it had died. After replacing I noticed that on power on the front buttons would not work. The input the monitor is looking at  HDMI-1 and I could not change to DP. I could also not power it off.  When I plug the power cable into the monitor it would come on so I could use it with the HDMI. Is the front switches a part that can be replaced? Also is it a switch that has to be pressed, meaning I hear and feel the buttons press, or is it touch sensitive? Also, is there any diagnostic tool that I can install that would query the monitor?

Any help would be appreciated.

Thanks!