If you guessed the lower connector goes with the green mouse label, you are wrong, but not alone in making this error. There is a tendency to plug the mouse into the lower connector! This may be because the lower connector is closer to the green mouse label. Or it may be that the positions of the connectors are seen as a "mirror reflection" of the positions of the corresponding label.
I just had to send you an e-mail to say, "AWESOME CATCH". I know what computer this is just by looking at it from the back; its a Compaq. I encounter this problem CONSTANTLY when I move my computer around at work or try to install a new one. This is obviously a "mapping" problem since the labels are not clearly "mapped" to the correct connectors. The color coding idea for the connectors is perhaps the best solution since DELL does this with their connectors and I never have a problem with installing a keyboard and mouse on a DELL PC.
Another solution would be to use color coding to associate the connectors with the labels. See photo B.
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