No external Monitor signal after Boot Camp Update

processor93

Registered
I've recently done Boot Camp and gotten pretty much everything running. I'm on a laptop which I plug into a big old ViewSonic monitor. It's set up to be a mirror on the Mac side, and was doing the same thing in Windows until the Most recent Boot Camp update download from Apple Software update.

Now all I get is a dead monitor, "no signal". I've tried going to the displays Control Panel in Windows, but the second monitor is greyed out (it was before, but at least it worked, even if the resolution was way off).
 
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