Dual Monitor not working for Mac Pro (Early 2008)

Upon upgrading from Lion to Mountain Lion yesterday I lost the ability to use my secondary monitor. Checking in System Preferences it indicates that it only sees one monitor, but nothing has changed with my hardware configuration. Is anyone else having this problem?
Hardware specs:
Processor  2 x 2.8 GHz Quad-Core Intel Xeon
Memory  26 GB 800 MHz DDR2 FB-DIMM
Graphics  ATI Radeon X1900 XT 15 MB
Software  OS X 10.8 (12A269)

Not sure if this has any relation to yours, but I thought I would throw it out there...
After installing Mountain Lion, the secondary monitor for my 27" iMac would not wake up after the computer slept. In the System Preferences, there was only the main display listed. The secondary monitor was visible from a cold boot, but disappeared once the computer slept and was woken up.
I found that waking the system with the Magic Trackpad would not also wake the second monitor. When I wake the computer by using the keyboard, the second monitor wakes normally! I've repeated this several times... Strange.

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    Hi there
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    Fra: RoninEdits <[email protected]<mailto:[email protected]>>
    Svar til: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>>
    Dato: Thursday 19 February 2015 11:40
    Til: Jon Berntsen Huseby <[email protected]<mailto:[email protected]>>
    Emne:  Hardware for Mac Pro early 2008
    Hardware for Mac Pro early 2008
    created by RoninEdits<https://forums.adobe.com/people/RoninEdits> in Hardware Forum - View the full discussion<https://forums.adobe.com/message/7209429#7209429>

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    See here: https://discussions.apple.com/message/20289931
    See here:  https://discussions.apple.com/thread/4391012
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