I've plugged the monitor into both an iMac 2006 and a MacBook 2008. Red shows up as black. I've set up the monitor in System Preferences and on the monitor itself. The color red simply shows as black. Is there something I'm missing or is the monitor likely broken?
I've searched online and can't find similar issue.
Edit: Now I'm *really confused: can't be the monitor, because I tried plugging a different monitor (from a friend's computer) and I have the same problem.