Hp f2105 21 inch monitor

how do i get a picture? my monitor shows two messages briefly, they are; monitor sleep and dvi no input signal. how do i get a picture? what am i doing wrong in trying to get a vga picture only.

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More about f2105 inch monitor
  1. Do other monitors work? Have you tried a different screen. Sounds like it's not recognizing the video card. Usually I get that problem when the system isn't working properly.
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