Dual monitor rotation does not work :(

Hi Everyone,
I have a Mac Pro. It has a NVIDIA GeForce 7300 GT Graphics card, and I am trying to connect two monitors to it and have them both rotated at 90 degrees. This is possible when one monitor is connected. It is also possible to have both monitors connected and on rotated and the other not. But when I try to rotate both, the secondary display just goes black. The cursor still appears when I mouse over that monitor, but no windows show up on it. Any ideas as to how I can fix this so that I can have both monitors connected and rotated 90 degrees?
The monitors are,
Dell2407WFp, and Dell2408WFP
Thanks!

Assuming that you do not see the lock icon which would indicate that the screen is in fact locked ....
Quit the mail app completely and reboot. Go to the home screen first by tapping the home button. Double tap the home button and the recents tray will appear with all of your recent/open apps displayed at the bottom. Tap and hold down on any app icon until it begins to wiggle. Tap the minus sign in the upper left corner of the app that you want to close. Tap the home button or anywhere above the task bar.
Reboot the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons.

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Vince.
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****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer

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Dual monitor rotation does not work :(

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