I am trying to attach an external monitor to my MacBook Pro using VGA to DVI adapter and then DVI to Thunderbolt.

I have MacBook Pro 2012 with Retina display and the monitor is Acer V223HQV.

Problem is that when I connect it the external monitor doesn't start working but is visible under System Preferences → Displays. Anyone can help me out here? What extra information I can give you to help solve this problem?

  • You mean Macbook → TB → DVI → VGA → Acer?
    – deceze
    Commented Nov 4, 2013 at 16:18
  • Yes, exactly... Commented Nov 4, 2013 at 16:19
  • Isn't it easier to buy a new monitor? ;o)
    – deceze
    Commented Nov 4, 2013 at 16:19
  • Maybe, but I would prefer using this one. Commented Nov 4, 2013 at 16:24

1 Answer 1


It's not possible because the Mini-Displayport ("Thunderbolt") to DVI adapter outputs a DVI-D (digital-only) signal, while DVI to VGA adapters work by taking the analog signal out of DVI-I (digital+analog).

You'll need a Mini-Displayport to VGA adapter.

  • Exactly right sir.
    – aknewhope
    Commented Nov 4, 2013 at 17:05

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