Ever expose how filthy your computer screen is during an important meeting? While trying to show a friend something on your computer? Over time screens accumulate dust, strands of fuzz, fingerprints, ...

If you feel there’s no such thing as too much screen real estate, you might want to recycle your old Mac as a display for your laptop.

When it comes time to get a new Mac, you have three options: Trade in your old Mac, sell it, or hold onto it. Macs tend to maintain a good amount of value but some Macs are more in demand than others.