List your system specs and I'll track it down.
Thanks for the offer and sorry for the delay.
My desktop is a Dell Dimension E520, the screen is Dell 2007 WFP.
According to Control Panel / Display / Advanced Settings, the Adapter Information is
Chip Type: ATI Radeon Graphics Processor (0x7183)
DAC Type: Internal DAC (400MHz)
Adapter String: 256Mb ATI Radeon X1300Pro
Bios Information: 113-AA67626-107