Monitor hooked up to 2 computers vga and dvi Dvi says no signal input

I have my monitor hooked up to one pc by dvi and to another pc by vga. Vga works fine but pc using dvi sends no signal to monitor
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More about monitor hooked computers signal input
  1. What if you unplug the VGA cable? Is there a monitor input menu?
  2. If you are running a windows operating system, go into control panels and detup your display there. Windows does not always automatically access your 2nd screen.

    Are you using a discrete grpahics cards or onboard. Not all onboard system will support two monitors.

    Try shutting down your computer and only connecting the VGA cabled monitor. Do you get your windows startup screen on this monitor then?
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Graphics Cards Computers DVI Monitors VGA Graphics