Thanks for those who had responded. We were able to get this resolved. The systems, by the way, were iMacs with ATI chipsets. Microsoft tech support told us that the particular model in these units could only support extended displays, not mirrored displays. That didn't make a lot of sense to me, because it seems to me that extending a display is more complex than mirroring one. Anyhow, after we got off the phone with them, one of my techs figured how to get it working by disabling one of the displays.
-----Original Message----- From: John Hornbuckle [mailto:[EMAIL PROTECTED] Sent: Thursday, August 07, 2008 5:22 PM To: NT System Admin Issues Subject: OT: Vista Dual Display Problem I've got a Vista machine that has two displays--a monitor plus a projector. I have no problem getting Vista to extend the desktop across both displays. However, that's not what I want; I want a mirrored setup. Can't get that to work, though. When I uncheck the option to extend the display to the projector, it disables that display altogether and stops sending a signal to the projector. It's either extended, or off altogether. Anyone ever see that? John Hornbuckle MIS Department Taylor County School District 318 North Clark Street Perry, FL 32347 www.taylor.k12.fl.us ~ Upgrade to Next Generation Antispam/Antivirus with Ninja! ~ ~ <http://www.sunbelt-software.com/SunbeltMessagingNinja.cfm> ~ ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~