Precision M60: Bizarre resolution behaviour

Precision M60; Windows XP SP2; nVidia Quadro FX go700

I recently noticed that after detaching a second monitor (actually a TV), the resolution on the laptop seemed stuck at 1600 x 1200 (it supports 1920 x 1200). I could drag the slider in the Display properties up to 1920 x 1200 but when I hit [Apply], it resets to 1600 x 1200. I tried updating the driver (from v4.4.2.4 2003-05-27 to v6.14.10.7811 2005-08-16) from the Dell Support site but, after installation and rebooting, it now seems to be stuck on 800 x 600 (yeah, I don't know how I managed to make things worse either).

So I tried uninstalling the drivers and uninstalling the device, rebooted in Safe mode. Windows detected the hardware and I reinstalled the latest drivers.

Finally, I reboot again and the login screen appears to be at the correct resolution (1920 x 1200). I log in and the resolution remains at 1920 x 1200 for a few seconds and then it burps (black screen) and back pops the 800 x 600 nonsense.

In addition, I get a message "This message is to inform you that a video resolution lower than 1920 x 1200 was requested. Resolution changes can be requested by the user, an application (i.e. a game), or the operating system. Resolution settings lower than 1920 x 1200 could result in a "fuzzy" looking display. The LCD panel on your computer appears best at resolution setting 1920 x 1200"

So I'm at a loss to figure out *what* might be "requesting" a resolution change. The card clearly works; the screen is capable of the right resolution but it just keeps resetting to the lowest resolution. I'm open to any suggestions!

Thanks.

A.