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I have used the free version of partition assistant to shrink the Windows 10 c:\ partition from 837 to 750 gigabytes. (Windows 10 volume manager only could shrink it with a few megabytes.)
I also checked optimize for a SSD.
The computer had to reboot to continue and thereafter the computer showed only a blank screen for a few hours.
I thought that it just couldn't boot and hadn't started with the resizing, so I rebooted the machine. Booting in my Linux partition, I saw that the filesystem on the c: partition was corrupt, so something had been done. I rebooted again in the Windows 10 partition in the hope it somehow could continue.
Now in total it has shown this blank screen for one and a half day and I want to know if it makes still sense to wait any longer or should I assume that everything is lost.