Screen dims randomly with Mac Pro - NOT a Macbook

After upgrading to Mountain Lion, my screen will dim randomly when watching movies or YouTube. This is on my early 2008 Mac Pro - not a Macbook Pro which seems to have this problem commonly. I've searched and searched and lots of people have this problem with a Macbook Pro (battery saving feature or something) but there are no options to defeat screen dimming that I can find for a Mac Pro!! Mountain Lion just keeps getting worse and worse!
HelP!

Hello, thanks for taking the time to help me out!
This is a 2008 MacPro (2x2.8 GHz Quad-Core Intel Xeon) running Mountain Lion OSX 10.8.4.
I am running two monitors: a HannsG HH281 and a Hewlett PAckard HP w2408h.
When this first was happening back in March 2013, I thought it had something to do with the ambient light sensor on the HP (the HannG doesnt have a light sensor), but it also might have has something to do with the dynamic contrast on the HannsG. I had shut those features off, and I actually hadn't had this problem in a while and there has been a few Mountain Lion updates since then.
I just tried to reproduce this by turning on/off the dynamic contrast on the Hanns G - did not get the problem
again. I also just turned the ambient light sensor on for the HP, and again, the problem did not occur.
So it is hard to say if the problem is gone away or not or if it just is not showing itself at the time being?
Here is the graphics card and display info from the System Profiler:
ATI Radeon HD 2600 XT:
Chipset Model:          ATI Radeon HD 2600
Type:          GPU
Bus:          PCIe
Slot:          Slot-1
PCIe Lane Width:          x16
VRAM (Total):          256 MB
Vendor:          ATI (0x1002)
Device ID:          0x9588
Revision ID:          0x0000
ROM Revision:          113-B1480A-252
EFI Driver Version:          01.00.252
Displays:
HH281:
Resolution:          1920 x 1200 @ 60 Hz
Pixel Depth:          32-Bit Color (ARGB8888)
Display Serial Number:          939LK3NA01178
Main Display:          Yes
Mirror:          Off
Online:          Yes
Rotation:          Supported
Television:          Yes
HP w2408:
Resolution:          1920 x 1200 @ 60 Hz
Pixel Depth:          32-Bit Color (ARGB8888)
Display Serial Number:          3CQ8410GZF
Mirror:          Off
Online:          Yes
Rotation:          Supported
Television:          Yes

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To all who are experiencing any of the frequently reported problems with the hardware/software combination listed in the subject heading:
I purchased the ATI X1900 XT as an upgrade fro my Mac Pro in January. I never experienced any issues with the card in OS X Tiger, but several months ago I began to experience overheating issues in Windows XP (Boot Camp) when playing graphics-intensive games. The overheating caused visible graphics corruption/artifacts, graphics system resets and even spontaneous system restarts. The frequency and severity of these symptoms actually increased over time, leading me to believe that the card was either defective or that the overheating was causing degenerative/cumulative damage to the graphics hardware.
I recently upgraded to OS X Leopard, and all **** broke loose. Immediately after upgrading, I began to experience frequent graphics corruption/artifacts (in the form of spurious horizontal lines), system lockups/freezes and spontaneous system restarts. None of these issues were present in Tiger. The system became completely unreliable and essentially unusable.
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Dear regards,
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