If I am reading this correctly this article states that “With Power Media Dock added, VAIO Z can manage up to four displays (including the notebook screen) via HDMI™ and/or VGA output ports”, so it would seem that two of the external monitors will need to be connected to the Power Media Dock and one to the notebook (via HDMI or VGA). Not having seen this model or the Media Dock It’s all a tad confusing but this video tutorial may be of assistance.
This proofs to me that it's possible to connect up to 3 monitors, as I try to do. But, it does not work for me.
I do as they say in the youtube movie. I connect two screens to the dock and connect the last one to the hdmi port on the laptop.
If I open opp the screen resolution properties in windows 7, the screen is detected and I can set the resolution as if things were ok. The problem is it's still black. If I connect the VGA and switch off and back on signals to all monitors screen shows up (I found this out today, so there is progress). The problem with the vga cable is I get "flimmer" on the screen, so Ideally I would like to see it connected the hdmi port.
All three screens are Benq monitors.
So, I end up with the following questions:
1) How do I get the screen working with the hdmi port
2) How do I get rid of the "flimmer" when connecting with the vga cable?
Please check that the Display Mode is not be selected as the graphics mode (instead choose External Display Mode) and this apparently should sort it out.
To change display mode: Fn+F7 and click on settings then change graphics mode and apply. The screen resolution chosen must be unified for all displays (and supported).
As an aside, although possibly not relevant at this stage, some applications may not work on multiple displays. The external display itself must support this function and of course if you are playing HDCP content the display should support this.