I prefer not to use block device hot attaching with Windows VM. Instead of it could be used persistent attach (qvm-block with -p option) or USB device attach.
After incorrect shutdown Windows usually tries to run safe mode or recovery console which doesn’t start Qubes GUI agent and qrexec services, so you can’t see VM screen. You could make this boot system screen visible with debug check option in VM settings tab or by setting ‘gui-emulated’ feature to 1:
qvm-features [windows] gui-emulated 1
That might be Windows kernel exception aka BSOD because of hot block plugging.
Stop hot attaching block devices to Windows 