1 Connect the monitor you want to use for the Mac OS environment to the video port on the computer (or to the port on the computer's video card).
2 Attach the middle connector on the loopback cable to the PC Compatibility card.
3 Attach the short connector on the loopback cable to the second monitor cable.
4 In most cases, leave the long connector on the loopback cable unplugged. But if the computer has an additional video port, you can plug the long connector into this additional port. Doing so will allow you to switch the monitor between the PC and Mac OS environments.
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