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Not sure which file you mean Hermannhuang. I reverted to a known good backup from Time Machine (used the same one last time) and when it started...
So this is what happened. Reverted to an older backup, installed Parallels tools and all seemed OK. This morning Windows 10 prompted me to install...
Thanks for your reply, Took snapshot, reset as suggested - a fair bit of disc activity then nothing, exactly the same blank/black screen....
Unfortunately this was the latest upgrade to High Sierra but I will uninstall tools and see what happens!
Not sure when this happened - It could have been after the latest Apple OS update went through! All software is on the latest versions and was...