I have a ASUS monitor that will display VGA on a laptop, but HDMI will not display. When I plug it into my PC tower, it will not display in either VGA or HDMI. I have tried plugging in, then powering on, and powering on, then plugging in. Anyone have any thoughts? The Laptop is a Gateway, the tower is homemade, but I do know that an older monitor has displayed on it.
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On the tower, does it have a video card, or motherboard video, or both?
If both, have you tried both to insure the card is enabled?