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Question: multiple monitors

I am trying to connect two HP P223 monitors to a Mac Book Pro OS X El Capitan Version 10.11.16

I bought a Mini display port VGA, HDMI, DVI, DP 4 in 1 Adapter and I also have a Mini Display port to VGA port.

I tried to connect the Mini Display port to VGA port (which is fine for one monitor) then connect the DP to each monitor (thinking that would work but it did not), connected the DP and VGA into the 4 in 1 adapter which also did not work. I am lost as to what to do or if this will even work. The system does not detect the other monitor....and there is no button for detection...Please help.

MacBook Pro, OS X El Capitan (10.11.6)

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Mar 13, 2018 4:02 PM in response to AlexMed123 In response to AlexMed123

There are more than 50 computers that bear the name MacBook pro, released over more than a decade.

¿which is yours, including year and screen size?

what ports are available to use for this adventure?

That appears to be a DisplayPort display:

1 DisplayPort™ 1.2
( with HDCP support )


Mar 13, 2018 4:02 PM

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Mar 14, 2018 8:10 AM in response to Grant Bennet-Alder In response to Grant Bennet-Alder

OS X EL Capitan

Version 10.11.6

MacBook Pro (15-inch, Mid 2009)

2.66 GHz Intel Core 2 Duo

4GB 1067 MHz DDR3

NVIDIA GeForce 9600M GT 256 MB

Ports - Mini DP, Firewire, 2 USB ports, Ethernet and power.

User uploaded file

Trying to attach to two Monitors:

HP P223 Display 21.5 inch 1920 x 1080

These Monitors Only have a DP and a VGA port

Mar 14, 2018 8:10 AM

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Mar 14, 2018 10:10 AM in response to AlexMed123 In response to AlexMed123

That model MacBook Pro supports its built-in screen at 1440 by 900.

It also contains Hardware to support ONE external Mini DisplayPort display at up to 2560 by 1600. Both internal display and external display can be used at the same time, and can be concatenated along ANY edge to create an "Extended Desktop".

Converting the Mini DisplayPort to VGA is nonsense -- it only serves to degrade the display quality and refresh rate. A [Mini] DisplayPort to [Full Size] DisplayPort cable should not be expensive because it is just a re-wire, no electronics inside.

To add a second external display, (which will NOT have graphics acceleration, and will be a bit slow to update) add-on solutions require two parts:

• the obvious stuntbox with some sort of display output connector. These usually connect via USB or some other data port.

• the required software that creates and manages a "software Display Buffer", and sends it out to the stuntbox, such as the built-in Drivers for your external box, which may already include third-party software such as DisplayLink software.

this is an example:

NewerTech USB 3.0/2.0 to DVI, VGA, HDMI Video Display Adapter, US$50


Mar 14, 2018 10:10 AM

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Question: multiple monitors