How to use 3 external monitors on 15" late 2013 MacBook Pro Retina? Several people have posted about how they use 3 external monitors with their MacBook Pro Retina. see:


http://www.youtube.com/watch?v=qJhvyLB_Tbw
Using 3 External monitors on my macbook pro, problem with DVD player
How many monitors can the new retina MacBook Pro handle and at which pixels resolutions?  


However, when I attempt to do this on my 15" late 2013 MacBook Pro Retina, I can only run 2. Either, 2 thunderbolt, or 1 thunderbolt and 1 HDMI. When I plug in all 3, only 2 of them work.

Apple tech says


  Yep. You can only have 2 external monitors (unless you want to add a usb monitor).


Is there some trick I am missing? Some setting to tweak? I have 3 monitors just waiting for the solution. One of my monitors feels quite left out...
3 external displays DOES work. 

I am on a Late 2013 MacBook Pro. I have 1 monitor on the HDMI port, 1 on a displayport to HDMI adapter, and one on an ACTIVE displayport to DVI adapter. I'm thinking that the trick here is to use an Active DVI adapter (mine is from Accell)