Desktop pc issues

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Have you tried to run your pc in an LCD monitor then show no dislay?? i mean my unit won't run in an LCD monitor until i put video card in it...i use the built-in video card in my unit but show no display but when i put a video card in it, the monitor works....i am sure that there is no problem in the built-in vga because before i put the video card i test it in a CRT monitor and it shows display...what could be the possible reason? does some monitor don't work without video card? why was that?? need idea please....