10.5.2 and Mac Pro monitor resolution issue

I installed 10.5.2 this morning from Software Update and it has now defaulted to a resolution that my LCD monitor cannot display. I can't even boot into Open Firmware, to the Mac Pro DVD, or bring up the drive selection screen (holding down Option when booting) as my LCD continues to say that it cannot support the resolution of the Mac Pro.
I had the settings set to the native resolution (1280x1024) before installing the 10.5.2 update and had all updates before the 10.5.2 update installed prior to installing it. I have reset the PRAM many times, reset the SMU, and tried connecting the LCD via both VGA (with the converter) and DVI. I plugged in an old CRT monitor and was then able to get into System Preferences but even after setting the LCD to the correct resolution and refresh rate it continues to say it is being sent an unsupported resolution. My LCD is a Samsung monitor but I don't recall the exact model number right now.
With the CRT monitor I was able to start downloaded the latest graphics update via Software Update but had to leave for work before I could install it and see if that fixed the problem.
I have seen a number of Mac Book Pro users with an external display problem after updating but was wondering if any Mac Pro users were having this problem or if anyone knows how to fix it. Thank you for your assistance.

Update: My monitor is a Samsung 913T and is less than 2 years old. I installed the driver update via Software Update but there was no change in behavior. Any CRT monitor I hook up works fine but I don't have another LCD to test. I tried reinstalling the 10.5.2 update but there was no change with that either.
I am now using Time Machine to roll back my Mac from right before I applied the 10.5.2 update. I doubt this will fix the problem as it seems to be deeper than that but I figured it was worth a try. I'll also be calling AppleCare support on Monday (hopefully they aren't closed for the federal holiday). I am still seeking any help or suggestions on this front. I don't have the money for a new monitor at this time and would really like to get my current LCD working as it was before with 10.5.1.

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