Parallels Black Screen Troubleshooting
https://kb.wisc.edu/helpdesk/page.php?id=9006728.02.2019 · Parallels Black Screen Troubleshooting This document details how to fix the common issue where a Parallels Virtual Machine is stuck on a black screen. When a Parallels Virtual Machine is left unattended for a long period of time, it is common for it to get stuck on a black screen, where closing the application, restarting, and reopening will not fix the issue.
KB Parallels: Windows 10 hangs with black screen on ...
https://kb.parallels.com/12423826.05.2020 · Symptoms. Windows 10 virtual machine starts with black screen, forcibly stopping the virtual machine and starting again makes the issue to be gone, but next starting/restarting of virtual machine will stuck again with black screen.. To know how to forcibly Stop virtual machine check the following article.. Cause. Windows 10 fast startup feature enabled.