The second monitor did not work when I first booted up in Windows, although it was working fine in the Mac OS. Booted in XP, I had to go to Control Panels / Add New Hardware and go through the 'wizard' song and dance. That did not work the first time. I rebooted and tried it again, and both monitors are now operational. The default resolution is 800 x 600 (or something like that), so setting the correct resolutions was the next step.
Both monitors are working fine now in both environments.
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Add Second Monitor To Mac
Second Screen For Macbook Pro
If you've bought a Mac mini or Mac Pro, you'll need a display to go with it; and even those with an iMac or MacBook might fancy a second screen. Another approach that's workable is to link the two Macs via an Ethernet cable & use screen sharing. I was recently demonstrating a 2005 G4 PowerBook connected to a video projector. On your Mac, choose Apple menu System Preferences, click Displays, then click Display. Open the Display pane for me. Set both displays to the same resolution. In 2019 Apple updated macOS to version 10.14 (aka Catalina). This brought the ability to use some iPads as a second screen for some Macs, so that may be a simple solution for you. We look at how to.