Dell Precision 490 Quick Reference Guide - Page 11
to the computer when you start the computer. - support
UPC - 683728237578
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For single- and dual-monitor capable cards with a single connector One VGA adapter: VGA Use the VGA adapter when you have a single-monitor graphics card and you want to connect your computer to a VGA monitor. Dual VGA Y cable adapter: Dual DVI Y cable adapter: VGA VGA DVI DVI Use the appropriate Y cable when your graphics card has a single connector and you want to connect your computer to one or two VGA monitors. Use the appropriate Y cable when your graphics card has a single connector and you want to connect your computer to one or two DVI monitors. The dual-monitor cable is color-coded; the blue connector is for the primary monitor, and the black connector is for the second monitor. To enable dual-monitor support, both monitors must be attached to the computer when you start the computer. Quick Reference Guide 11