MacBook Pro 2011 does not detect external monitor

I have a MacBook Pro 13'' early 2011 runing Lion 1.7.2.
I have an HP v185ws external monitor connected via an Apple Thunderbolt to VGA connector.
Since last month's Thunderbolt firmware update, my external monitor is no longer detected.
Does anybody has a solution to this problem?
Thanks.

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).
And nothing.
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.

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MacBook Pro Mid2012 does not detect external monitor

After i upgraded to MAVERICKS now using my " BELKIN HDMI TO THUNDERBOLT ADAPTER "
when i connect it to TV the monitor flashes black and nothing happens no signal on TV go to settings display and sound there is nothing and when i disconnect HDMI it flashes black again ,,, help please ..
i doent know if its from MAVERICKS OR HDMI CONVERTER OR SMT TV OR THUNDERBOLT PORT

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).
And nothing.
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.

Macbook Pro(Mid-2014) Not Detecting External Monitor

Hi everyone, I'm trying to connect my MBP to an external monitor via HDMI. Since my MBP has an HDMI port built in, I'm not using any adapters between it and the monitor. But nothing is happening when I connect the HDMI cable, my MBP does not seem to detect it. I have tested my monitor with that HDMI cable on a desktop PC, and it all works without any issues there, so I reckon it must be something on the MBP end of the connection. But what could it possibly be? I have looked through forums and read countless threads about external display problems, but have not found any info that could identify the problem. I have tried booting my MBP and/or turning on my monitor before and after connecting the HDMI cable, and there was never even a hint of detection.
I'm running OS X Yosemite 10.10.1, and the external monitor in question is an HP Pavilion 27Xi in 1080p.

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).
And nothing.
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.

HT5167 after I updated to 10.7.4 my macbook pro 2011 doesn't detect external display anymore what should I do?

after I updated to 10.7.4 my macbook pro 2011 doesn't detect external display anymore what should I do?

after I updated to 10.7.4 my macbook pro 2011 doesn't detect external display anymore what should I do?

Probook 4520s does not detect external monitor on Windows 8.1

I have problem, when I connect my laptop on external monitor LG Flatron W 2240. Laptop does not detect. I make conection with VGA cable (cable checked and it works). I try to reinstall my grphic driver, but it does'nt help. I use graphic driver for Windows 7 Professional 64 bit. I had Windows 8 and the external monitor worked fine, but now I have only black screen on monitor LG.

@Rebeca1986
‎Thank you for using HP Support Forum. I have brought your issue to the appropriate team within HP. They will likely request information from you in order to look up your case details or product serial number. Please look for a private message from an identified HP contact. Additionally, keep in mind not to publicly post ( serial numbers and case details).
If you are unfamiliar with the Forum's private messaging please click here to learn more.
Thank you,
Omar
I Work for HP

MacBook Pro 2011 Won't Detect External Dell Display

I have a brand new 2011 MacBook Pro, 17" that I use with a 24" Dell E248WFP monitor. I purchased a Moshi HDMI to DVI adapter, and at first everything worked fine--I would use the MBP with the lid closed, everything would show up on the display, and everyone was happy. Then I disconnected my MBP one day and took it somewhere, and when I came back I couldn't get the external display to connect. But then I tried some things and it did. The next time I disconnected my MBP from the display I had problem again, but after 10 minutes of fiddling around it finally worked again.
Over time, I found that different things would work, but not consistently. That is, sometimes I could merely click on "detect displays" and that would fix the problem. Other times I would put the computer to sleep, then shut the lid and move the external mouse or press a key on the external keyboard, and that would work. Sometimes if I just left it alone for a half hour I would come back and the external monitor would suddenly work for no apparent reason. But it was rarely consistent. What worked one time would not work the next.
This week, I went somewhere with my MBP, and when I came home I couldn't get it to connect. I have now been trying to fix this for two days and although I have tried hundreds of things I can't get the monitor to connect. Yes, the monitor is on. Yes, the monitor works otherwise and appears to be in fine functioning order.
I have tried restarting, resetting PRAM, shutting down, starting up with the monitor unplugged and then plugging it in, starting up with the monitor plugged in, shutting the lid while restarting, not shutting the lid while restarting, putting the MBP to sleep and then shutting the lid and then pressing a key on the external keyboard (it wakes up my MBP but nothing comes up on the external monitor), I've verified that the internal and discreet graphic modes are both working, and many other things. I have no idea what else to try, but I do know it doesn't seem to be working.
What I have not tried is connecting the MBP to a different monitor, but given that I already had problems before wherein the monitor would work, not work, work, not work, etc., I'm inclined to believe it's a software issue with the MBP, as opposed to any hardware problem with the monitor, although I suppose it could be something with the MBP.
I've examined many other threads from people seeming to have this problem, except none of them seem to have run into such a dead end as I have. And while I would love to have an excuse to buy a 27" Mac display for $1,000, I'd also love to have an excuse not to. If anyone has more things I can try to fix this, please let me know.

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!
^_^

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!
^_^

MBP does not detect external monitor on DVI connection...

(2007) MBP C2D 2.33 15", OSX LION 3gb. Worked fine till about 3 days ago (right after installing the last round of updates).
My external monitor now fails to connect on DVI cable. Since it also has VGA, I was able to test this way with a DVI to VGA adapter and that worked perfectly, but the vga gives a lower resolution. Having estalished that the graphics adapter and the monitor were okay, I looked for other issues.
Starting the MBP in clamshell mode, it found the monitor on DVI. Then restarting normally, it all worked fine, UNTILL the MBP went to sleep. when it awoke, no external. Plugged, unplugged, trashed display prefs, nothing, though it does still work via DVI-VGA.
I don't think having to clamshell everytime is a workable solution, but I NEED MY DESK SPACE!
Any thoughts?

Yesterday, having had the problem become far worse, I too tried PRAM/NVRAM clearing (SMC reset so many times I can't count them). Then, in desperation I purchased TechtoolPro 6 and ran it. Everything s working well now, and in fact the video issue cleared up while techtool loaded, it didn't even wait for me to run the thing!
More: About 3 weeks ago, I made a HardDrive image from an older white macbook so I could repair its hard drive. After doing that job, I (thought I) deleted the image from my MBP, but the disk still showed 80Gb used that wasn't before. So while I thought I had 130GB free, I was only showing 50. After running the directory rebuild, I now have 175gb Free! So the directory was keeping track of 95GB that WASN'T there! I suspect this had something to do with my problems. Then running the Defrag and Optimization routines, my 2007 MBP is running like a brand new machine. Other things that had been buggy (like the right click on my magic mouse) are now working like they should.
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[Solved] Xrandr does not detect external monitor

I recently just installed Arch linux on my laptop and decided to install the catalyst driver as well. I followed all the instructions on how to install catalyst and when I try to use the xrandr command it does not show my second monitor. I am using i3wm on the latest kernel and catalyst driver. I can also see a x cursor when I move my mouse to my other screen but it does show the i3bar or I cant drag a window to the other screen
Here is my xorg.conf
Section "ServerLayout"
Identifier "aticonfig Layout"
Screen 0 "aticonfig-Screen[0]-0" 0 0
Screen "aticonfig-Screen[0]-1" Above "aticonfig-Screen[0]-0"
EndSection
Section "Module"
EndSection
Section "Monitor"
Identifier "aticonfig-Monitor[0]-0"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
EndSection
Section "Monitor"
Identifier "aticonfig-Monitor[0]-1"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
EndSection
Section "Device"
Identifier "aticonfig-Device[0]-0"
Driver "fglrx"
BusID "PCI:0:1:0"
EndSection
Section "Device"
Identifier "aticonfig-Device[0]-1"
Driver "fglrx"
BusID "PCI:0:1:0"
Screen 1
EndSection
Section "Screen"
Identifier "aticonfig-Screen[0]-0"
Device "aticonfig-Device[0]-0"
Monitor "aticonfig-Monitor[0]-0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
Section "Screen"
Identifier "aticonfig-Screen[0]-1"
Device "aticonfig-Device[0]-1"
Monitor "aticonfig-Monitor[0]-1"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection
what xrandr -q shows
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 1920 x 1920
LVDS connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
1366x768 60.00*+
1360x768 60.00
1280x768 60.00
1280x720 60.00
1024x768 60.00
1024x600 60.00
800x600 60.00
800x480 60.00
640x480 60.00
DFP1 disconnected (normal left inverted right x axis y axis)
CRT1 disconnected (normal left inverted right x axis y axis)
Last edited by Green (2014-09-16 01:00:22)

Never mind I just needed to delete my xorg.conf and regenerate it by
# aticonfig --initial

MacBook Pro does not sense external monitor (Panasonic HDTV in my case) via thunderbolt-HDMI connection...Is update 10.8.3 helping anyone?

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Kimapurado
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Jaco

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MacBook Pro 2011 does not detect external monitor

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