To change the Displays icon in System Preferences to display your actual computer, navigate into:
Open another Finder window, and navigate into this folder:
Replace (after backing it up, of course) the Displays.icns file in the first window with an icon from the second window -- preferably one matching your computer from the com.apple. series. You might need to empty your system caches before it starts showing up. This is a system hack, so as always, please back up before doing anything dangerous.
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