New answers tagged dvi
On my Mac Pro I use the mindisplay to DVI adapter from Apple. It has a usb (male) cable and a USB port on the DVI adapter end. I don't use the USB at the second monitor so nothing is plugged in. However, I only get a signal to my second monitor if the USB cable is plugged in! The monitor has a separate power (D-plug) source, and I've tried restarting, ...
It is not officially possible to connect two external DVI monitors to a MacBook Air. Apple's support article states that you can only connect one non-Thunderbolt monitor per Thunderbolt port. Additionally, you can look at hooking a second screen up via USB, using a product like those made by DisplayLink.
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