MACBOOK PRO - NO SIGNAL OUTPUT TO EXTERNAL DISPLAYS

When connecting any external monitor I have an intermittent issue where it does send the signal to the external display - yet it shows the display's preferences in the Control Panel. Had an embarrassing moment at a presentation with an LCD projector. Have used severalo DVI adaptors. Any ideas? It works sometimes, sometimes it does not. When it works I cannot close the lid either without it turning off everything, which used to work fine.
Any ideas?

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...
I get extreme fuzz/snow with colored pixels, with the background display flickering on every 30-45 seconds behind the fuzz (i.e. very grainy). On one occassion, the display showed up perfectly for a nanosecond and went back to fuzz. Common sense is telling me that the image is trying to be sent to the TV but the signal is not strong enough? Or, the encoding is not fast enough?
Tried the following:
Grabbed another HDMI cord in case it was the originally cord - no dice.
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!

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Connecting HP 2311x display to new macbook pro Retina - no output on external screen

I have a brand new MacBook Pro 15 in. with Retina display. I also have a HP 2311x monitor. When I plug in the HDMI cable, the external monitor says "check video cable" and the preferences "arrangement" thinks there is a display - even recognizes the type - but the external display just wont display anything but the "check video cable" box. I spent 2 hours on with apple yesterday, they had me do all sorts of resets and stuff - but no luck. The HDMi cable works when connecting a pc to the screen. When connected to by macbook, the screen on the macbook likes to flash black and its annoying. I have gotten really used to working with two screens.... and apple's suggestion was to buy a thunderbolt cable and try that. As it is, with this new macbook I have to buy a bunch of cables, I really don't want to buy another one when I am not sure that will work. Darn things are expensive when you are buying 4 connectors at once (ethernet connector since the speed via wireless is noticably slower; magsafe to magsafe2 converter; thunderbolt for my printer; and a connector for the monitor at home which doesn't have an hdmi port).
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I have an HP 2311x as well. I'm using an HDMI cable and am not having any issues getting the screen to display. I know you said the cable works with a PC but have you tried a different HDMI cable just in case. It might be worth a try. Other than that, I'm not much help.
The issue I had when plugging this monitor into my MBP retina was that the image was very blurry on the HP 2311x. I almost gave up on using it and was going to just buy a Thunderbolt display but after much research I found a custom firmware update that fixed the underscan/blurriness issue. So be prepared for that if you get the screen to display.
If I can find that resource, I will post it here.
Good luck!

EXACTLY what cable(s) do I need to connect my MacBook Pro (early 2011) to an external display with a 2560x1440 resolution?

I am trying to connect my MacBook Pro (early 2011 w/ Intel HD 3000/ 384Mb) to an external display with a 2560x1440 resolution. Specifically, what cable/connections do I need to display at this resolution? I cannot get the display to work using a "Thunderbolt to HDMI" or a "Thunderbolt to DVI" connector. Note: I used both older and newer (uni-directional) HDMI cables on the first config, and a Dual-link DVI cable on the second config. Apple specs state this is possible ( support.apple.com/kb/SP619 ), but I am at a loss as to how this can be done. Thanks in advance for the help!

You use a Mini DisplayPort to either HDMI or dual-link DVI adapter. If that component doesn't work, something's wrong with either the cable or something else in the connection.
(112855)

Macbook Pro won't work with external display?

The very first time I connected my brand new Macbook Pro to my 23" Cinema Display the laptop screen displayed mostly static, though the external monitor continued to work. The computer was sent to Apple for repair. Apple replaced the logic board. Though the nature of the problem changed following the "repair" (the Macbook's screen now goes dark instead of displaying noise) the laptop still will not drive the external monitor successfully without multiple re-starts. I've experimented with turning the sleep mode on and off as well as the screen saver. No effect. Is anyone using this set up successfully or is there some fatal design flaw in the Macbook Pro? System 1.4.8, 2 gigs RAM. Thanks.
Macbook Pro Intel Duo Mac OS X (10.4.8)

Thanks for the input. Yes, I've driven the 23" with another Mac. I took the laptop back to the shop today. Hopefully they can resolve the issue.
Macbook Pro Intel Duo Mac OS X (10.4.8)

Macbook Pro 2011 won't detect external display.

Firstly - I've searched this problem several times now and I've found this problem in four of five discussion topics on this board, each with 4 or 5 pages of people adding "I'm having the same problem" but in all of that there wasn't a single response from Apple, instead they just 'archived' the discussions and hoped that people would just go away.
That's pretty ******* disgusting customer service, considering the amount of money we're paying for your products. You owe us at least for them to ******* work properly - not just ignore major problems, which are clearly present for quite alot of your customers.
For months I've had no problems just plugging my MBPro into an external monitor by DVI using the Apple certified DVI-thunderbolt connector.
For some reason, a few weeks ago, the MBPro stopped detecting the monitor.
I have to spend about 20 minutes ******* around, unplugging and replugging in the leads, restarting with and without the leads plugged in, resetting the p-ram, reinstalling OSX 10.7 and it always seems to be just a random time when it decides to start working.
I'm not just some kid ******* around with an expensive computer for the fun of it. I make a living using this system and I need the big screen for the work I do. I don't have the time to spare every sodding day to be ******* around with **** that doesn't work properly.
At first I thought the problem was restricted to just my work display as it appeared to work fine on all other displays. However, last week I was giving a presentation at work to a company who were potentially about to spend mega bucks giving us some work. I turn on the screen and plug in my computer to show the presentation. Nothing happened. luckily I was able to quickly transfer the presentation to another working computer (a PC) and continue on.
But seriously, please justify spending over £1000 on a computer that can't perform the simplest of tasks without spazzing out?
And secondly - stop ignoring this problem and get fixing it. Now!

Hi, I'm having the same problem, tried to connect both a Viewsonic and a Hanspree. Was happy to find your response here, but I just got the Moshi adapter with the macbook pro so it seems silly it would have gone bad. :/
I suppose I'll take it into the Apple Store and see what they say. Thanks!
^_^

Can I use my macbook pro mid 2012 as an external display using thunderbolt port

Hi,
I want to use my macbook pro (mid 2012) screen as an external display for a raspberry pi using a HDMI to Thunderbolt cable, via the thunderbolt port on the macbook pro. Would this be possible? Can the macbook pro's thunder bolt port act as an input and is any additional software required?
I look forward to hearing from you.
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Welcome to Apple Support Communities
You are referring to Target Display mode. Target Display mode can only be used in 27-inch iMacs and iMacs with Thunderbolt, not MacBooks Pro > http://support.apple.com/kb/PH11302
Unfortunately, you can't use the MacBook Pro as a display. It doesn't support the monitor mode

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Hi there. I have a question about the external display configuration.
I recently connected my 2011 Macbook Pro 13" (10.8.2 Mountain Lion) to an external HD-TV using Thunderbolt to VGA adapter. After connecting the TV had 1920x1200 resolution which made the text and everything look very tiny. So I thought I'd lower the resolution a bit. But then I messed up and accidentally changed the resolution and refresh rate for the external display to one that wasn't supported. So the TV went black and gave an error about an invalid resolution. At the same time, on my Macbook screen I had only the background image and display settings dialog. No mouse cursor, no menu bar, no dock etc. So I couldn't do anything.
I disconnected the Thunderbolt adapter and got my Macbook screen back to normal, but when I plugged it in again, the same thing happened. Invalid resolution on TV, just background image and display settings on Macbook screen.
Now, this was just before I was going to give a presentation and it resulted in a very awkward situation with me franticly re-plugging the Thunderbolt adapter and looking just completely clueless In the end I had to borrow my colleague's laptop.
So my question is: when this happens, is there a way I can reset / clear the external display settings back to defaults? They are obviously saved somewhere since replugging the Thunderbolt adapter didn't give me back my original resolution.

A PRAM reset should solve that:
From the article linked above:
Your Mac stores certain settings in a special memory area even if it is turned off. On Intel-based Macs, this is stored in memory known as NVRAM; on PowerPC-based Macs, this is stored in memory known as PRAM.
Information stored in NVRAM / PRAM includes:
Speaker volume
Screen resolution
Startup disk selection
Recent kernel panic information, if any
To reset your PRAM:
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

New macbook pro 15" won't detect external display using vga adapter

Hi there
I've tried multiple monitors and connectors but i can't get my mac to detect an external display. it responds as if nothing is connected. I'm fully up to date software-wise.
any ideas?
thanks for any help!!

Hi, I'm having the same problem, tried to connect both a Viewsonic and a Hanspree. Was happy to find your response here, but I just got the Moshi adapter with the macbook pro so it seems silly it would have gone bad. :/
I suppose I'll take it into the Apple Store and see what they say. Thanks!
^_^

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No, not reliably. If it's paired with both machines you can turn it off and turn it back on but it's a toss up which machine it will connect with. If you took it to another room so the iMac didn't see it, you'd have to disconnect the minidisplay port/thunderbolt cable and then it would exit target mode display.

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The issue is when I connect MB HDMI port to HDMI, my external display renders a really horrible picture. The display is really fuzzy and the fonts look horrible too. I have tried all different types of settings. Can anyone suggest anything?
Please help

Thanks but I tried using another cable but same result. I do get a signal when I set it to 1080p but it looks awful. When I try to set it to the external displays native resolution I lose the signal.
Surely other people have encountered a simliar problem?

Macbook Pro - Applications wont start without External Display

Hi all,
Apologies if this question has already been answered, but I have spent a lot of time Googling to no avail...
I have an early 2011 15" MBP with the following spec:
Model Name:          MacBook Pro
Model Identifier:          MacBookPro8,2
Processor Name:          Intel Core i7
Processor Speed:          2 GHz
Number of Processors:          1
Total Number of Cores:          4
L2 Cache (per Core):          256 KB
L3 Cache:          6 MB
Memory:          8 GB
Boot ROM Version:          MBP81.0047.B24
SMC Version (system):          1.69f1
AMD Radeon HD 6490M / Intel HD Graphics 3000
Snow Leopard Mac OS X 10.6.8
I normally use the MBP with a 27" Cinema Display connected (mini display port/thunderbolt connector) and the clamshell shut. All is fine.
However, if I remove the external monitor and want to use the MBP with just its own display, some applications will not start. They bounce int he dock for a while and then hang, and need to be forcibly killed. Not all applications behave this way, but so far I have experienced this with Aperture 3.2, Omnigraffle, Parallels, Pixelmator.
Does anyonw have a clue whats going on and how to fix?
Thanks

Hi Grant & Bob
Thanks for your responses.
The adaptor has been removed from the Mac, and I have tried all the obvious solutions (like using detect displays), but to no avail.
I will try and investigate some other scenarious (like using a different external display) and see what happens.
Thanks

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Hi,
When I pull out the cable for my external display (connected via VGA>Mini display port) 90% of the time my computer hard locks and I have to hold down the power button to reboot. For some reason I'm still able move my mouse, but I can't interact with anything when it freezes. I've already re-installed the OS several times to no avail (I kept my personal files).
Mid-2010 MacBook Pro
OSX 10.8.2
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Also I have this problem where if I come out of sleep to the login screen and then don't click anything for a bit my screen will go pure white until I click/use the keyboard, which brings me back to the login screen. Not sure if related.
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I also have this issue.
Macbook Pro Mid 2010 13"
2.4 GHz Intel Core 2 Duo
8 GB Crucial ram
Mac Os 10.8.2 (mountain lion)
Using Samsung 22" monitor with VGA to mini displayport as well
Usually it depends what I am doing but 30mins - 4 hrs I can expect my both of my screens to go grey (or sometimes flash green or purple) and totally unresponsive
Then I have to force shut down the laptop and boot up again. Rinse, repeat.
Tried the complete delete and reinstall of HD
SMC updates all done, but still happens
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Macbook Pro 13"- HDMI output does not display 1920x1080

Hi
When I connect my Macbook Pro 13" to my Samsung 46" TV using the Apple HDMI to HDMI cable
The Macbook detects the TV but doesn't give me the option to change the resolution to 1920x1080
I have tried 1080p and 1080i but these does give me the correct setting either
Has anybody any ideas?
J

See
http://mac.bigresource.com/Hardware-Mini-Display-Port-NOT-working-at-resolutions -over-1600X1200--G5rVJl3Wm.html#Ae8cBkplo
Apple doesn't "do" 1920x1080 with non-Apple Studio monitors. It's bait & switch, a fraud, immoral, unacceptable. A Mac lover & evangilist for 20 years, I'm now likely to never buy another. I bought a new Asus monitor today, just to discover my MacBook Pro won't talk to it because Apple made their computer compatible with only overpriced Apple Studio monitors, not the leading brands.
Here's that post, pasted. The answer's the same for VGA and DVI.
Mac Pro :: Mini Display Port Not Working At Resolutions Over 1600X1200?
Problem:
Apple Mini Display Port does NOT work at resolutions over 1600X1200 on NON Apple Cinema Displays.
That means if you own any other brand of monitor such as NEC, Lacie, etc. you will NOT get native resolution on your 24 inch monitor as it is stuck at a maximum resolution of 1600X1200.
This story was mentioned on "Macbreak Weekly" show 4-14-2009. I have since checked with a few people and it would indeed seem to be true at this point.
I REALLY hope a solution from Apple comes soon and this is not some new policy of theirs. If so, it may be the last Mac Pro I will or can ever own. The reason is I do a lot of 3D work with C4D, Vue, Modo and Photoshop CS4 so I MUST have a monitor like the high-end ones from Lacie that have 100% color gamut and Adobe RGB. I can NOT be tied down to an Apple Cinema display due to that work. At this time, it seems this means I would only get 1600X1200 resolution on that 24 inch monitor.
I am HIGHLY concerned by this. Has anyone else confirmed this too and if so what the heck is Apple thinking or better still going to do about it? I LOVE my Mac Pro but if they start forcing Apple displays on us then I won't be buying another Mac, it's just that simple.

MacBook Pro using an HDTV as External Display

I come to you again with another quandary im sure youll be able to help me with. I have a MacBook Pro 15'. a few years old. Recently bought a 42" LCD HDTV and hooked it up using it as an extra display. Video works perfectly for what im using it for, an extra BIG display. however, the audio is still coming from my MacBook. Is there a way to make the audio come from my LG TV speakers and not my MBP. Thanks for your help

Yes you need a lead from the small phono headphone out socket into the HDTV - depends what Inputs it has to determine the exact cable needed - possibly 2 phono jacks ? possibly a TosLink (Digital Audio) cable ?

MACBOOK PRO - NO SIGNAL OUTPUT TO EXTERNAL DISPLAYS

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