What do I need to do to change from a HD computer monitor to regular monitor?

eipo19772005

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Sep 9, 2010
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I have a old Dell computer which I brought a 24" Dell HD monitor. I upgraded it with a new graphics card which has both VGA and HD capability hook-ups. Now we have a new tower to go with exisiting 24" monitor. My problem is I can not get a old standard VGA monitor to work with the old system listed above. When I plug in the the VGA monitor plug in the VGA outlet in the old computer I get no signal to the monitor. What do I need to do with drivers or other wise to get the old computer back to being able to be used with the old VGA monitor?