No signal to external Display/LCD-TV

I own a Macbook Air 13" (Late 2010) and used to connect it via Mini-Display-Port to HDMI-Cable to my LG 37" LCD TV. While on Snow Leopard everything worked fine. Now I upgraded to Lion and I am not able to get a signal to my TV. The MacBook Air lists my TV in the display settings but I cannot get a signal to my TV. I tried ever resolution and setup but it does not work. I also tried to delete the com.apple.windowserver.plist and resetting PRAM, nothing worked. Can anybody help me with this? Greetings from Germany.

Did you do anything to make it work? Mine used to work but when I tried it a different TV the adapter and TV weren't recnized by the the MacAir?

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No signal to external display

I'm having trouble with connecting my Macbook Pro to my Samsung TV (via HDMI) to use as an external display. When I plug the HDMI cable into my laptop the screen flashes like it detects another display but then nothing changes and the TV still reads no signal. I've connected the laptop to a different TV and it worked just fine. I tried connecting a different laptop to the TV and that one didn't work either. I've also connected an AppleTV to my Samsung (the one I'm having issues with) using the HDMI cable that I'm trying to connect the laptop with and that worked as well. I've tried both the STB and DVI HDMI ports on the TV and neither of them work.
Any help would be greatly appreciated.
For more information:
It's a late 2013 Retina 13" Macbook Pro running OS X 10.9.4.
The TV is a Samsung UN29F4000.

Hi there Elpenor,
You may want to try the troubleshooting steps located in the following article to help you address this issue:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
Thanks for coming to the Apple Support Communities!
Cheers,
Braden

The dock indicator lights look fairly dim on the MBA display, but bright on external displays (LCD TVs for example). Any fixes?

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Stupid question: if I toggle through the display settings (F7), it doesn't seem as if any go to shutting off the external display (like maybe I want to make a change I don't want my audience to see, I would like to shut it off without unplugging, then turn it back on when I'm done). Did I just not toggle through enough? Or is there a different mechanism to accomplish this?
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Open the Display arrangement pane of Displays preferences
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MacBook not sending signal to external display - was working fine before.

hi guys, i have a unibody macbook and i've been hooking it up to my tv for almost 2 years now using the mini display port to hdmi adapter and hdmi to my television.
tonight the macbook randomly stopped sending signals to the tv. i tried two tvs with two different display adapters as well as a DVI monitor.
the displays are detected in osx but there is just no signal sending to it. anyone have any ideas? did my mini display port just die? i've tried several cables/adapters.

Hey,
I just experienced a similar problem as the original poster, except that I'm using a minidisplayport - DVI adapter and not HDMI. Been working fine on my external screen for 2 months now and suddenly the external says no signal?
Macbook still flashes a blue screen when plugging in the adapter but does not detect the external. Haven't ruled out that the adapter is busted yet, but worked fine earlier.
I tried resetting the PRAM without any change.
Any kind of software / hardware problems on the macbook?
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No signal on external display

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It's too bad you never received any help on this in the Forums, but was hoping you may have come across a solution in the last 2 years.
I am not a techie, so my explanation will be crude, but sounds exactly like your issue above. It's October 2013...I have a 2008 MacBook Pro. Everyone tells me I can use the miniport to connect to my 2010 LG TV. I purchased a Mini DisplayPort to HDMI Adapter from RadioShack (Gigaware brand). I plugged the adaptor into my minport, plugged the HDMI cord into the adaptor, and plugged the other end of the HDMI cord into the LG TV (44"). In my display preference, the MacBook recognizes the TV. However, there is virtually no picture...
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Tried all 4 HDMI inputs on the TV - no dice.
Myriad other non-technical things like moving the MBP around, jiggering with connections, etc. Nothing.
For purposes of meeting my needs, I ended up downloading the latest Apple TV software and ended up displaying my presentation via Airplay from my iPad. But that solution drops a lot of the key attributes of my presentation (slide builds don't work, certain graphics missing, color is off, etc). It worked sufficiently, but I was hoping for a more solid presentation solution.
Thanks for listening!

How do I set MacBook to an external display when the plug and play doesn't recognize it? I am trying to set my Samsung 530 LCD as a monitor but HDMI and VGA cords (and the adaptor for them) doesn't seem to work.

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Message was edited by: dclowd9901

No external display signal

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LCD External Display reverting to uncalibrated state

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So much for me and my big mouth...yeah great monitor that LG....NOT!
The piece of junk took a dump and hour ago and now it's back up at the store...refund.
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CMD F1 was the keyboard shortcut....

MacBook Pro's Color LCD "shifts" when connected to external display?

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I have two images to show what I mean:
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This is what it looks like with the external display connected: <http://www.flickr.com/photos/vazexqi/4559271260/sizes/l/>
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Message was edited by: Nicholas Chen

@Stefan: Thanks for the tip. I tried it but unfortunately it didn't solve the issue. The color is still off.
Incidentally, just out of curiosity, I tried these two things:
1) I tried the "Mirror Displays" option in the Displays Preference Pane. With this option enabled, both displays actually displayed the right colors (right with respect to how each display is calibrated).
2) I opened the same desktop wallpaper in Preview. Whenever I drag the Preview window so that it spans/crosses both displays (external and Color LCD), there is a light flicker in the wallpaper in the Preview Window. For that brief moment, I can see that the color is right before it changes to the shifted color on the Color LCD.
I found a possibly related thread on a different forum <http://arstechnica.com/civis/viewtopic.php?f=19&t=37841>. That doesn't seem to help when both displays are connected.
Now, I am just wondering if this is considered normal - wonky color shifts between the desktop/different windows happen when you have two displays connected....
Nick
PS: Note that I am not a graphics designer so my definition of right/wrong is just based on my experience looking at the wallpaper and remembering what it should look like on each display by itself.

Broken LCD - Can not get external Display

My screen is no longer good so im trying to connect a external display.
Been trying for hours trying to get the external display to work of boot.
Ive tryed everything changing 2 sets of hd cables and svga cables. The funcion key.
The Laptop does reconize the display but seems to go into powersave mode or something.
The only way i can get the external display to work is if i pull the battery and wait a bit then power
up the display will work with a notice on the screen that cmos will be reset to defaults then restarts
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Pavillion dm4-1160us
This question was solved.
View Solution.

HI Ezfilez,
I understand you are having an issue with the external display on your Windows 7 computer.
Sometimes it is in the BIOS. If you follow the link and update it should help resolve your issue.
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&dlc=en&docname=bph07110
Please let me know if you require further assistance.
Thanks
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

No signal to external Display/LCD-TV

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