LCD native resolution not available in system preferences

I need to set my resolution to 1680 x 1050 and that resolution is not vailable. I have a original G4 Mac Mini with Tiger. The monitor has dual inputs for both VGA and DVI, sometimes it will work with the VGA input but not consistantly.
I need to use the DVI input now to leave the VGA input free for my KVM.
I have tried Zapping my PRAM multiple times, starting the Mini with the monitor unplugged, swapping between the DVI and VGA inputs on the LCD monitor, and swapping between my old CT monitor and the new LCD. None of this works.
The LCD always detects as "LCD Display".
I have been unable to find information on where the monitor resolutions are stored, one thing which I would have liked to try would be manually editing the file to the correct resolution.
What else can I try?
Thanks in advance!

Hi Brian, sorry about your issue- it's frustrating isn't it? The file you need to edit is in system > library > frameworks > IOKit.frameworks > Versions > A > Resources, and it's called IOGraphicsProperties.plist. If you activate the root user temporarily using the NetInfo Manager, you can edit the file with textedit, save it to the desktop, then drag it into the Resources folder to replace. When you look in the file, you'll see the following:
<key>gtf-resolutions</key>
<array>
<integer>640</integer>
<integer>800</integer>
<integer>1024</integer>
<integer>1280</integer>
<integer>50332928</integer>
<integer>67110144</integer>
<integer>1344</integer>
<integer>1400</integer>
<integer>1600</integer>
<integer>1920</integer>
<integer>2304</integer>
</array>
<key>gtf-resolutions-wide</key>
<array>
<integer>640</integer>
<integer>800</integer>
<integer>31458128</integer>
<integer>1024</integer>
<integer>1280</integer>
<integer>67110144</integer>
<integer>50333008</integer>
<integer>1600</integer>
<integer>1920</integer>
<integer>2304</integer>
I had the same problem as you. I bought an Acer 22" widescreen, with a native resolution of 1680 x 1050, which wasn't "available" in the displays control panel. After some swearing and lamenting the olden days in OS9 when you could just willy nilly see all the resolutions, i added my resolution the this file and it showed up in the control panel. You'll have to monkey with it to see how it works, but basically you're going to add another 'integer' line, like so:
<integer>1680</integer>
If this is too hairy for you, or just too much trouble, i highly recommend SwitchRes. It works perfectly for this problem, and you can input the specifications for your monitor exactly and it will install the resolution so that it's available to the system. Its cheap too.
good luck to you!
G5 1.8 dual Mac OS X (10.4.3)

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