I have a Dell Inspirion 570 with a 23"(dia) VGA monitor. I have connected, using the TRITON SEE2 Xtreme External DVI/VGA Video Card, a second monitor at 15" (dia), by Sony[salvaged from a VIAO tower CPU] to this Dell 570.
Both monitors boot. I can position the Sony on either side of the Dell. I can move email and files back and forth. And, I can work on either or both screens. The problems are: 1.) 'Personalization' in the Control Panel will not 'Detect' and 'identify' the Sony monitor. 2.) the screen resolution on the smaller Sony monitor is magnified to the level necessary for the larger Dell monitor.
3.) The Triton, however, identifies the Sony monitor as #3 for position purposes.
As far as attempted remedies are concerned:
1.) the bundled ATI Catalyst Control Center only assisted with identifying and inatializing the Dell monitor.
2.) Geek Squad of no help.