OK so I did a very silly thing on my macbook. I turned the screen brightness all the way down while booted into Windows 10, using the slider control. I found myself with a black screen, unable to do anything because I couldn't see anything. I rebooted to mac and started windows in parallels, with the brightness now restored as it is controlled on the mac side, and could find no brightness control in windows (thinking I could reset it in the VM). When booting into Windows the screen now stays resolutely black. Pressing F2 does nothing. Any ideas how I can restore my brightness in Windows ?
