Through other reviewers, I found that cables with both HDMI and DisplayPort connections only work with a computer's DisplayPort output to an HDMI connection on a monitor work; they don't work backwards. So if, like me, you want to connect a PC's HDMI output to a monitor's DisplayPort, you'll need one. This requires USB power, which is usually available on the back of the PC, and 7" cables keep these two ports on the PC a little over a foot apart.
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