Hi again.
Well, I'm pretty sure there is no way to do it, but maybe someone else here has some ideas.
I suppose you could leave the monitor off until the computer is booted (I do that all the time because I have everything except the computer on a master power button, so I just turn on my computer and go have coffee) but once the start screen comes up it's pretty obvious that it's running Windows.
How often do you need to Restart your computer?
The only time I do that is when I'm installing updates or software that requires it, so it doesn't happen that often.
Mike