UniChome IGP detecting old CRT

[bdpratt]

I have a P4800Pro chipset with UniChrome Pro IGP.
I had a ViewSonic CRT monitor I used with this system.
Today I upgraded to a widescreen LCD.
I am able to select the correct resolution (1680x1050) in the display properties. But the actual screen shows a 2 inch black band at the bottom.

I do have the latested MoBo Bios installed, which supports widescreen displays.

In the S3Display tab of the Unichrome control panel, it lists my old ViewSonic CRT as the one and only display. I cannot get it to remove the CRT and add the LCD instead.

When I uninstall the UniChrome driver, and use the basic Windows VGA adapter driver, I am able to select 1680x1050 and the actual screen display is correct, with no black bar.

When reinstalling the UniChrome driver, 1680x1050 gives a black bar again.
I understand what is happening. The UniChrome driver thinks its outputing to the old CRT. So since I select 1680x1050, it actually outputs 1600x1200 (confirmed by the LCD OSR panel), and creates a scrolling desktop for the extra 80 pixels in width. For the extra 150 pixels in the 1200 vert, it set them black.

I'm sure the display would be correct if I could get that ViewSonic monitor purged from the UniChrome config. But I've been unable to determine where it's getting it from. Please help!

[tcsenter]

Download and unzip the latest drivers for P4M800 PRO IGP:

http://www.viaarena.com/Driver/P4M80...Shld_logod.zip

In Device Manager, expand the Monitors category and uninstall the current monitor (probably generic Plug and Play monitor). In Add/Remove Programs, uninstall all individually listed S3 Graphics utilities first; e.g. S3 gamma, S3 info, S3 overlay, etc. Lastly, uninstall the display drivers. When you restart, press F8 immediately after the BIOS screen to open advanced boot options menu (the same menu used to start in Safe Mode). Select "Enable VGA Mode" then continue booting to Windows.

When Windows detects new hardware, cancel the New Hardware Wizard. Browse to the directory where you extracted/unzipped the driver package, locate and run setup.exe to install the new S3/VIA display drivers. Restart when prompted. After Windows loads, it may detect the monitor as new hardware. If so, let Windows install the best driver (probably generic Plug and Play Monitor again). Now try setting the correct resolution and color depth, restart if prompted.