cd /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/
sudo mv public.generic-pc.icns public.generic-pc_lame.icns

# use this if you want a generic LCD/AIO icon
sudo cp com.apple.mac.icns public.generic-pc.icns

# use this if you want an xserve server icon
sudo cp com.apple.xserve.icns public.generic-pc.icns

echo "script complete."
exit