Tech enthusiasts know that finding ways to keep aging hardware out of the landfill is great for the environment even if your daily-driver Mac or PC is in need of an upgrade. That’s easier said than done, though. I found a way to buy an old iMac for under $100 for use as an external monitor, until disaster struck. Amid the chaos of my apartment move, I shattered the 2012 iMac’s display, and that left me seriously puzzled as to what to do with it. I couldn’t fix it, because I could buy two more iMacs for the price of a replacement screen.