I am using MacBook Pro 2014 with Catalina OS and installed windows 10 with boot camp. It was working fine for more than 3 years sunddenly today black out and I can not see the longin screen however sometimes comes and go quickly as 1 sec. when restart Mac side working perfect with no issue only when I start windows. Also I don’t know how to reach windows safe startup since I am using windows in Mac. Any one can help ?
MacBook Pro Retina
It may take some tricky timing but I would think
once you select the Windows drive in the boot manager
and as soon as the screen goes black, press the keys
for Windows safe mode.
Did you try multiple consecutive boots into Windows?
Usually if there is some Windows issue doing that kicks
you into the Windows "recovery" where you can chose
the various startup options, i.e. boot normally, repair
Windows, re-install, etc.. AT least that's what it did the
last time I had a boot issue with Windows 10.
Alternatively, create a bootable Windows installer and
initiate recovery from it.
windows 10 doesn’t have safe mode like before F8, as you said one time took to repair but I don’t know I want to get to this report windows again but I am not unable
I think Win10 now is supposed to automatically enter the Advanced Boot menus when it is reboots after an incomplete boot. I think it was a mistake for MS to remove the F8 hot key for booting to the Advanced Boot menu as that is an extremely useful feature. Of course I haven't had any success fixing Windows boot issues for the last several years so I guess it doesn't really matter if F8 no longer works.
If you are unable to access the Advanced Boot menu then you will need to boot from a Windows USB installer as @woodmeister50 mentioned. I don't know if a standard Windows USB installer will work on a Mac due to possible driver issues. I also don't know if you can make a compatible Win10 USB installer for this system on another Mac (again if Boot Camp Assistant customizes the drivers for a particular Mac).
Did you create a backup or backup image/clone of the Windows partition you can use to "fix" it? Our organization uses WinClone to do this so you may want to consider this for future reference as it won't help you now. This only works as long as you don't change the partition layout at all.
Sudden black out on windows 10 after latest MSISO update
