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If you can't find an HDMI port on your computer, then you probably either have really low-end graphics card, ancient card, or have integrated graphics.
There are few DVI to HDMI cables, you can use that, if your graphics card / computer has a DVI port.
By "typical computer" do you mean you went to a big box retail and bought a pre-made? If so, you have integrated graphics, which won't include an HDMI port.
You'd need to buy a graphics card, and since those pre-made computers usually only have barely enough of a power supply for the hardware you get, you'll probably have to get a new power supply as well.
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