I am trying to install QGIS on a win 10 Desktop PC, on which QGIS 3 was running until Win 10 has been reseted and compeletly new installed. After the installation, the QGIS splash screen shows up (QGIS is ready) but the main window remains empty (-not responding-, as reported by some other users as well).
I have tried allmost all versions 3.10, 3.14, 64/32Bit and Installation with OSgeo4w - always the same result: QGIS not main window is not responding. I also have removed local Appdata before every installation, also all hardware drivers seem to be up-to-date.
Any Ideas or Suggestions? Are there any logfiles available, which might help to find the Problem? Are there any additional tools/ programs needed?