Hp pavilion aooo has no output signal to asus vh198t monitor

I tried a different pc tower and it worked OK.

Hi again,
so this one is your pc:
http://h10025.www1.hp.com/ewfrf/wc/document?docnam​e=c00255589&tmp_task=prodinfoCategory&cc=us&dlc=en​...
Video and graphics card are the same.
You have pci slots only, so you can change the slot.
Does the pc seems to boot at all?
One thing you can try:
Your mobo has an integrated graphics chip - put out the graphics card and connect your monitor to the vga connector of the mobo.
See if anything is displayed.
HTH
V.
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