Dell S2240L not working with MBA 11" 2012 !

I recently bought a Dell S2240L. I tried to connect it to my Macbook Air 11" (2012) but the Dell Monitor was blank the whole time. I connected it to another laptop through HDMI (HP) and it worked. I got an icon of AirPlay on my Mac and it was very much connected to the Dell. The screen was mirrored. But, nothing on the Dell. Please Help !

Hi shashwatpanda,
Welcome to Apple Support Communities.
Take a look at the article below, it provides a lot of great information and troubleshooting suggestions that can help you solve the issue of connecting the external display to the Thunderbolt port on your MacBook Air.
Apple computers: Troubleshooting issues with video on internal or external displays
I hope this helps,
-Jason

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Message was edited by: EZ Jim
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Here are the actors in our play today
1. MacBookPro A. (my system a CD2 2.16 with OSX 10.4.9)
2. MacBookPro B. (my friends system a CD2 2.16 with OSX 10.4.9)
3. an iBook (my friends 1.07 GHz G4 with 10.4.8 and a VGA adapter)
4. DELL 2300 MP projector
Plugged in DVI to VGA adapter to the virgin MacBookPro B (never had the projector plugged into it before) Dell projector shows that it recognizes an analog RGB 800X600 signal from MBP B. It projects a beautiful desktop. All is well for a moment.
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VGA Display
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I shut down/restarted the MBP B.
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Scene 2: The FREAKY thing!
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Now, what about my computer? I unplug from MBP B and plug into MacBookPro A, and NOTHING...the computer doesn't automatically adjust to a new resolution, and the projector doesn't recognize any signal from the computer.
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Now, logically I try again to immediately unplug the adapter from the iBook and switch adapters and plug back into MacBookPro B-it worked once right? But, sorry, NOT twice. The mystery deepens.
Well, I think, maybe it is because I didn't restart MacBookPro B before attempting the switcharoo from iBook to MacBookPro.
So, I plug back into iBook-projector. And the iBook works immediately again.
I restart MacBookPro B and plug in to the freshly restarted MBP B...HOUSTON WE HAVE LIFT OFF! The MacBookPro B recognizes the projector and the projector kindly displays the desktop.
Now what about MacBookPro A...Last time, when I did the switcharoo, it corrupted something to cause the MBP B not to work. Let's try it again. Will this plug-unplug-restart-switch adapters-immediatly plug in technique work...let's see. I restart MBP A, and plug DVI to VGA adapter in. Sorry. Same ol' no signals recognized. MacBookPro A not auto readjusting resolution, and does not list any projector in display prefs.
Let's get crazy and immediately plug the adapter into the MacBookPro B...it works-oh so logical...NOT! Why wasn't it corrupted this time by MBP A? MacBookPro B readjusts its screen to 800X600 stretched and projector immediately recognizes and projects desktop.
Now lets see if I can break it again as before. I unplug it from MacBookPro B and back into MacBook Pro B, knowing that this caused it to stop working previously. And...it still works-WHAT? I do it a third time. It still works on MacBookPro B.
So,
I plug it back into MacBookPro A...still nothing. Back to MacbookPro B works like a charm. This time it struggles a bit showing that initially it sees a signal from MacBookPro B of 1192X900 (i Think), then the MacBookPro B switches automatically to 800X600 and the projector works.
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Let's try the projector in MBP B....same deal. Now it doesn't work. Same symptoms of MBP A.
Back to the good ol' iBook. Of course it works.
Now switching over directly to a restarted MBP B. -DOESN'T WORK (as it did using this technique previously)
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As you can see, it is hard even with multiple computers to find a series of doing things that consistently makes the projector work.
Any thoughts, ideas, ways to diagnose? Thanks!

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Hi Talon, I just accidentally came across your thread. Maybe I can help. I own a 23-inch cinema HD display but mine is ADC and I have to run mine through an ADC to DVI adapter.
Anyways on to the discussion...
The nvidia 5200 is a rather old-ish card (or chipset). The feature set in these older cards are not necessarily symmetrically reciprocal (what?) throughout the feature set. In other words, the feature may work in one mode and not in the another mode...etc...
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and thought this would be great, my resolution is less than that @ 1920x1200 on my 23-inch cinema display. However I believe this may be referring only to the vga output signal and not the DVI. Read on...
Further down in the specs for the 5200 card/chipset you'll see:
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As someone said above your 23-inch is in *single mode DVI* and from my experience only accepts *single mode DVI input* from the graphics card.
From my understanding of the specs and your description of the delimma, I would suppose that you are able to get the 30 inch display to work because the 30 inch is a *dual mode DVI monitor* and your graphics card does work in dual DVI mode up to your 30-inch resolution but ONLY in dual DVI mode.
Here are the specs on it:
http://www.nvidia.com/page/pg_20040109440047.html
I hope this helps you out.
If you were to ask my recommendation, I'd go buy a new video card that has higher resolution on the single mode DVI output. I can tell you that my ATI 2600 HD Pro (AGP) (windows version, not mac only) has two DVI ports that are both dual mode DVI capable but also dumb down to single mode DVI signaling at high enough resolution to support our 23-inch cinema HD single mode DVI displays.
Good luck!
Dibit

Dell S2240L not working with MBA 11" 2012 !

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