Update on my experience so far, FYI:-
Microsoft has been supplying more updates lately, and in he latest package has been another Dell Controller &... - but the strange thing is, Tv seems to be targetting my second screen and putting in a 'Tv Gmbh' driver for it, removing the Eizo-provided and branded reference. =8-|
I have Dell U2711 and Eizo L568 monitors.
I can't find references in any devices to the Acer updates Msft added , and while they're listed in Win7's update log they're NOT removable items. Maybe they're just a driver file, not an entire 'update', per se.
The black screen wasn't operating when connecting from another (wireless) notebook on the LAN. Now when trying through my KVM box from a Vista machine the offer to install the b/s driver again appears. I've declined, accepting the 'fallback' method - and THAT works! Both screens. Both into standby, wrt power. Sheesh.
More to test, esp from the wireless notebook.
Re pmolson, down matt's route - give your system as much a cleanup as you can. Run Ccleaner from both your account and from the administrator's, including the registry scrub (accept to save backups). If you have another system cleaner you're happy with, run that too.
Do you have the latest driver package from your video adpater's manufacturer - usually big. Get that.
Do his suggested Screamviewer reinstall, too...
Reboot.