Cant use hdmi but can use vga

When I connect my HDMI cable to my tower and my screen I am unable to see anything, but if I use my VGA cable I can. Is there an option I need to enable or disable in order to switch from VGA to HDMI?
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  1. This would probably belong in the graphics card section. You will also want to specify what card you are using, and what drivers.
  2. Yes, update your drivers. What about DVI? That delivers the same quality of video as HDMI, just without sound, so you have to hook up sound separately.
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