Is it possible to connect two external monitors to a Retina MacBook Pro without using Thunderbolt displays?
For example, one connected with HDMI and another using Apple's DVI connector and also use the screen on the laptop.
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Yes, that should definitely be possible, as both Thunderbolt ports are also mini DisplayPort ports and the other would be connected via HDMI.
See also this answer: https://apple.stackexchange.com/a/54306/14994
Yes. In addition to the HDMI port, you can use either of the Thunderbolt ports as mini DisplayPort ports, just like all Thunderbolt ports.
I can confirm this. I have three monitors connected and running in addition to the retina screen. two via the thunderbolt ports and one hdmi
However this caused my retina display to flicker.