I use a secondary monitor with my 17" iMac Core Duo. When I boot in OS X, both monitors work fine. When I boot from my Windows XP partition, my second monitor doesn't work.
I install all the drivers, and when I enable the secondary monitor, my desktop shifts and my taskbar and icons move over to the secondary monitor, even though it's designated as secondary, and I can not see them. So the OS recognizes there's a second monitor there, but the damn thing remains blank.
Has this happened to anyone else?