If you are stuck in a "Constant Startup Failure" loop, Autodesk and community advisors suggest:
echo [2/4] Testing plugin isolation... ren "%MAXPATH%\Plugins" Plugins.TEST 2>nul "%MAXPATH%\3dsmax.exe" -silent -exit ren "%MAXPATH%\Plugins.TEST" Plugins 2>nul 3ds max startup failure detection updated
: The feature can identify and reset user preferences back to default settings, which is a primary reason for splash screen freezes. If you are stuck in a "Constant Startup