Did you try the PNPDeviceID in Win32_DesktopMonitor? Just a shot in the dark, after glancing through all the Sciptomatic classes. It seems to atleast have the model and some other long number..not sure if its serial or not...since im sitting in a class i cant really walk around and check the back for the SN right now

I didnt see anything about the monitor SN in the BIOS class though, unless its just not listed in the scriptomatic tool.