How do i view a desktop without monitor

Hello,
i have a hp pavillion a844n desktop and the monitor will not pick up signal from the computer...i have verified the monitor is working with a known good source (aka laptop). How can i see my computer?
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More about view desktop monitor
  1. Are you connected to a video card or the motherboard video output?
  2. Maybe a more important question - is the computer even running?
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