I had the same problem twice now.
First about 6 months ago my v1 cable died (G2 screen black and error code 1-4). HP sent me a v2 replacement cable and that solved the problem.
Some days ago my G2 stopped working again with the same problems as above. It was working fine one day before. I have tried everything what the forums say and even tried a brand new v2 cable that I bought as a spare. Still no joy.
Than as a last resort I made a widows restore to a point about a month ago. I have freshly installed windows 10 pro about a month ago so that point was just after the windows was installed and updated.
The restore was successful and when starting Microsoft app store I noticed 3 errors regarding Microsoft Visual C++ Redistributable. I cleared them/canceled them and stared Mixed reality portal and the G2 is now working as before!!!
So i guess some background updates in windows corrupted the WMR platform which is really bad…also because the user doesn’t notice anything. I thought the cable was again the problem but this time it was windows.
I will have to carefully do the next windows updates and check if they brake WMR again.
Hope this helps people because the Reverb G2 is great and makes MSFS2020 worth while. Going through this frustrations second time now I know how annoying and disappointing it can be.
Cheers!
