Currently Being ModeratedFeb 6, 2013 8:56 AM (in response to oscar68)
I have a problem connecting external display (Dell U2311H) to my 13" MacBook Pro (Early 2011).
I use Tecklink Mini DasplayPort to HDMI adapter (http://www.techlink.uk.com/products/wires_cables/wiresmedia/wiresmedia_media/wir esmedia_mini_displayport_plug_to_hdmi_plug), but since U2311H doesn't have HDMI input, I also use Manhattan DisplayPort to HDMI Adapter (http://www.manhattan-products.com/en-US/products/8101-displayport-adapter).
The display is not detected, no picture or even external monitor presence at all.
I even reset PRAM, and installed 10.8.2 Supplementary update.
I also plugged and unplugged all I could, with no luck.
As I can see on Apple discussion, it is a common problem with 2011 MacBook Pro's.
It seems like the problem is in Thundebolt port, it somehow does not work properly.
Currently Being ModeratedFeb 8, 2013 3:18 PM (in response to maximium)
In reply to my own post have to say appologies to Apple whose Thunderbold port I used to blame.
Shame on me)
So, what was my problem?
Manhattan DisplayPort to HDMI Adapter !
The point is it's actually do only what it said to do, converts DP to HDMI.
But I for some reason thought it can be used vice versa, to be HDMI to DP converter))
I was wrong.
I bought new one HDMI to DVI adapter and now I HAVE external display!
Thunderbolt works like a charm.
So I'm very satisfied now.
Currently Being ModeratedFeb 24, 2013 8:42 AM (in response to oscar68)
I think I have solved the problem, at least, it works for me and so far, is working straight.
With the external monitor unpluged in the minidisplay port, I set the gfxCardStatus to "Discrete", then, I plug the monitor and it's detected. I have tried it several times and it worked. When unplugging the external monitor, I set it to integrated again (because I'm not using the dynamic function). I just did it again, while writing this and it worked.
Weird thing is, once the external monitor is detected and working, if I chose "Detect Screens" from the Sistem Preferences, second monitor shuts down I think Apple went bi-polar.
Currently Being ModeratedMar 12, 2013 4:37 PM (in response to oscar68)
I had a similar issue and after reading the posts, was worried that my older circa 2006 dell monitor would not work with my 2011 MacBook air. But I did note something peculiar that might help someone out there.
I read a post about detaching and re-attaching the connection to the monitor. As i attempted this, the screen flickered and showed the wallpaper, but then went blank as I let go of the cable. I noticed that I needed to apply more pressure to the DVI cable going into the monitor. And when I let go, it would disconnect. I had to use a screwdriver to tighen the connection (the first time ever for me with a monitor cable), and it works perfectly now.
So, make sure BOTH ends are as tightly connected as possible and save yourself a headache!