Intel Mac :: Stopped Detecting External Monitor?
May 1, 2012
my iMac has stopped detecting my external monitor. It is a new iMac running 10.7.3, the monitor is connected via the thunderbolt port.
It was working perfectly fine, now its stopped for some reason.
Info:
iMac, Mac OS X (10.7.3)
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Jun 29, 2009
I have a 15" unibody MBP bought in Nov '08.
Had been using the Mini Displayport > DVI adapter just fine with both HDTV and Dell monitor, BUT then all output has stopped completely!
No monitor is detected by the laptop (although the display does blink blue, as if it had detected it), tried different cables, different displays, using the Displayport firmware update, speaking to Apple, deleting the com.apple..plist files, etc
Edit: it also doesn't work in XP on Bootcamp!!!?
None have worked even a bit!.. Also read lots of forum posts of similar problems, but I can't find a solution that works!
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Jul 1, 2009
I have a 15" unibody MBP bought in Nov '08.
Had been using the Mini Displayport > DVI adapter just fine with both HDTV and Dell monitor, BUT then all output has stopped completely!
No monitor is detected by the laptop (although the display does blink blue, as if it had detected it), tried different cables, different displays, using the Displayport firmware update, speaking to Apple, deleting the com.apple..plist files, etc
Edit: it also doesn't work in XP on Bootcamp
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Apr 23, 2012
I have a 27" iMac and I'm using Samsung SyncMaster SA850 as a second monitor (connected via a display Port cable with a mini Display Port adapter). Everything worked fine until yesterday - the Samsung screen turned black and now it only works with max resolution 1280 x 1024 (native is 2440x1440). I think I upgraded Lion 10.7.2 to 10.7.3 (I don't remember for sure though). When I connect the monitor to an iMac with 10.7.2 everything works fine. And another iMac with 10.7.3 has the same problem as me.
Info:
iMac, Mac OS X (10.7.3)
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Jul 4, 2012
My speakers suddenly stopped working. I've unplugged, rebooted ect & nothing works. I get lots of feedback but no sound & my Imac will not show them as an option in systen preferences.
Info:
iMac, iOS 5.1.1, I think thats my operating system?
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Oct 23, 2008
I have recently purchased Apple macbook 13" 2 Ghz, 2GB laptop and I am
using it in dual boot (MAC leopard and Windows XP) . Recently I have
purchased external Headphone of Creative (HS-390) and tried hell like things
in WINDOWS XP but it is not detecting my Microphone....The headset is working
fine the only problem is with Microphone (I have tested Microphone on Desktop
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Jan 24, 2010
i was in a car accident where my macbook was in a case, in a bad in my back seat. and it shattered the screen. of course my care protection plan wont cover it. so i have a external monitor that i am trying to use to navigate the computer. with the correct adapter.
i was hoping there is a way to detect and use the monitor....
this would be extremely easy if i could actually see the computer screen on my laptop... but the entire thing is solid white because of the crack. so i need keyboard shortcuts, or some way to control my computer using my macbook pro connected through firewire.
i wish i would have set up the file sharing, and remote management sharing before the accident. would have come in handy now. but i didn't.
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May 31, 2012
Problem exists on MacBook Pro (15", Late 2008) and MacBook Air (11", Late 2010) using a mini-displayport -> VGA adapter. When an external monitor (Dell E177FP) is connected it is recognized but appears as a "VGA Display". No problems with usage, however when the mac is put to sleep the monitor sees it as a no signal situation and displays its built in test instead of going into powersave mode. When I first hooked up the monitor I was using an old cable that was most likely damaged (screen was showing alot of artifacts) but this problem did not occur and the display slept fine. I then bought a new Belkin 6' VGA cable and have had this problem ever since. Â
I compared the two cables and noticed the new one had the #9 pin, where the old had just a blank. Thinking maybe this old monitor didn't like to have the 5V coming in I modified (Read: ripped out pin #9) my new cable to no avail. Â
Info:
MacBook Pro, Mac OS X (10.7.4)
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Mar 15, 2012
How to use the iMac 21,5" (the first one with Thunderbold) as an external monitor for the pc?
Info:
iMac, Mac OS X (10.7.3)
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Jun 9, 2012
I was wondering because I want to add an external monitor to my iMac
Info:
iMac
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Mar 13, 2012
I have an old PC monitor that I want to connect to my new 27 inch iMac, it's the latest edition, the one that doesn't have any mini display ports.All I have are four USB 2.0 ports and two Thunderbolt ports. No mini display port of any kind. So is there an adapter for me? My old monitor can use either VGA or HDMI and I'm not really fussed which one I use. A link would be most helpful, surley that are more people with the same problem.
Info:
iMac
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Jan 9, 2010
I have a 27" i7. I have a 24" DVI Montior hooked up to it via MDP->DVI adaptor. When the 24" Monitor is on, everything is fine. When I turn the monitor off, the magic mouse tracking on the 27" screen stutters. I am not kidding - it took me ages to figure out that to fix I either need to turn the other monitor on OR disconnect the MDP->DVI adaptor.
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Mar 7, 2012
im using a 27" imac... recently just bought a mini displayport to HDMI cable to hook it up to my 24" Benq 241 monitor.Im pretty sure ive used this monitor before without a problem on my old macbook. The monitors max resolution is : 1920 x 1200 but im only getting the option of :Â Â
1080i
1080p
720p
480i
480p
1600 x 900
1344 x 1008
.... the rest go down in numbers  selecting 1080p gives a fuzzy picture... and 1080i, is what looks liek the highest - but still really pixellated?
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Apr 10, 2012
I have a VGA monitor plugged in to my imac using the VGA adapter to the mini-DVI. All was working well. Since I updated over the weekend, the computer will not detect the monitor.Â
Info:
iMac, Mac OS X (10.6.8), VGA Adapter
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Jun 25, 2012
I bought a iMac G5 with Os 10.4 from my friends cousin, and it didnt have a airport card so I bought a Ralink Comfast wireless USB card to connect my pocket wifi so I could browse the Internet. I downloaded the set up for mac from their site and it all installed correctly and I connected my pocket wifi to it and it says good signal. But when I go into safari it still says 'You are not connected to the internet'. I've tried everything I can think of and emailed ralink and Comfast but their not responding. Â
Info:
iMac, Mac OS X (10.4)
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Feb 6, 2012
I recently replaced my older MBP (2007) for a MBP, 2GHz, Core i7 with thunder bolt. I normally connect to my external monitor, a Samsung SyncMaster B2230HD. This worked perfectly for my needs. I connect my MBP via a Mini Display Port to VGA adapter.Â
Display resolution:Â
VGA (External Monitor) 1920x1080 60 Hz
MBP Display 1440 x 900Â
Problem: Now with the new MBP, I get a black stripe on the left on side. (See pic)Â Â
Troubleshooting Steps:
a) Replacement VGA Cable
b) Replacement Mini Display Port Adapter
c) Tried a HDMI cable (worked but with disminish resolution and a yellow tint)
d) Adjusted both MBP and Samsung display settings include Auto Adjust.Â
I determined that the monitor is okay because the screen is filled with a lower resolution and "mirror display".
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Mar 26, 2012
I'm using 2 IMac 27' and one is simply used as an external display. When I wake up the computer from sleep, it works on the main monitor, however the external display still has a black screen. I have to unplug the external monitor to get it to wake up. I tried unplugging thunderbolt and replugging it in which worked the first time, but same issue again not waking up.
Info:
iMac
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Apr 7, 2012
This is not a Canon problem as other computers (PCs) detect the scanner and work fine. This was originally the easiest multi-function printer/scanner setup I ever did.The scanning is easy and worked fine for a couple of months, then several days ago it gave "scanner not available" message,tried deleting the scanner and then adding, now it will not detect the scanner ONLY the printer
Info:
iMac, Mac OS X (10.7.3)
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Jan 31, 2010
I have a G4 powerbook with an LCD that only displays the top 25% of the screen. I've been using an external monitor with it just fine. Today, I reinstalled the OS and ran into a problem. The main OSX startup menu (you know, where it asks for your location, timezone, personal info, etc) is prompting me for information, and I can't see the forms to fill them in! The external monitor defaults to "extended" as opposed to "mirrored", and the forms are embedded, meaning I can't drag them over to my external monitor. Obviously, if I can't fill out these forms and get to the desktop, the laptop is completely useless.
Does anyone know how to force the external monitor to be "mirrored" from startup? Is there a keycommand?
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Jun 14, 2010
I'm working with a Mac Pro (2x3 GHz Dual-Core Intel Xeon, 4 GB RAM) and a dual 23" monitor setup. Quite recently the second monitor stopped responding, after disconnecting everything, moving, and reconnecting. (Everything was boxed lovingly in its original packaging and moved by gentle movers.)
It isn't the monitors � both work fine in the first monitor port. The computer recognizes there is a second monitor attached, allowing me to access Arrangement options under System Preferences > Displays.
The power light on the second monitor comes on, blinking in the following manner (if it were Morse Code): dot dash dot....(then it is dark for about four seconds before repeating the same blinking sequence). It appears to have some sort of meaning.
Any ideas? Is there a way to reset this?
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Jul 30, 2005
I have been using the latest macbook pro 13.3" since April 2010. Over the last week the monitor suddenly goes completely white and the external monitor goes black. The laptop becomes unresponsive although the programmes opened continue running (e.g a skype voice call would continue without interruption although the monitor is all white).
The only solution at the moment is to press the turn off button for a few seconds then switch the laptop on again. It will then work normally until for no apparent reason this happens again.
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Aug 19, 2007
I recently got a PowerMac G4. When I viewed it Everything was working. Upon me hooking it back up I noticed It was not getting any picture. The Monitor was brand new so I did not figure it to be broken I checked the monitor on another computer and it worked great. From what I understand this is a common internal problem on the G4.
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Oct 16, 2008
I picked up a new MacBook yesterday and I noticed a weird issue when coming out of "monitor sleep" mode, not regular sleep mode.
When I move the mouse, the external monitor shows what you see in the picture, kinda like a TV with no signal. The MacBook screen works fine so what I just do is unplug and re-plug in the DVI plug and everything is good again.
My 24 inch Dell monitor worked fine with my M1330 and other computers so I know it's not that. Does anyone have the same issue or maybe give me some light on this?
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Nov 9, 2008
Is there a way to use my external monitor as my only monitor when connected to my mbp? Or, can i clone my display, but at separate resolutions? I am able to do this on windows with nvidia software, is there software that allows further customization?
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Jun 27, 2009
I have a 22" Dell external monitor on my MBP. I know that I just close the cover to my MBP to shut off the screen. What do I do in those instances that I want to use both screens? There has to be something simpler than restarting the MBP?
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Aug 5, 2009
As said, my current set up is an HDMI - DVI cable (HDMI to monitor and DVI to adapter) and my DVI - mini DisplayPort adapter, everything is connected fine but when I turn on the monitor, it says cable not found... and nothing is displayed on the screen but on the Macbook side of things, it sees the monitor is connected (I can extend the screen and leave the screen) but other than that, it appears I cannot get an image on the monitor, pressing every button on the monitor does not work either.
Any other information that may seem necessary, let me know. I tried clearing my PRAM and clearing the power and such but nothing seems to work.
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Apr 7, 2012
I'm using a mini display port to dvi adapter and dvi cable. 17" macbook pro is several years old and software is up to date.
the first picture is from the imac, the second is from the laptop.
Info:
iMac, Mac OS X (10.6.7)
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Apr 20, 2012
I have a 21" Samsung Monitor that displays at 1680x1050 which is attached to my 27" 2011 iMac. The iMac only has the display option of 1600x1200 60hz. This is not the right one clearly and the reason i wonder why it is not there is that my MacBook Pro which is 2009 unibody does have this option and both are running the same 10.7.3 OS.
Info:
iMac, Mac OS X (10.7.3), 27" QuadCore 3.4GHz i7
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Dec 12, 2009
I've hooked up my Macbook Pro 2009 to my external monitor and everything works. The issue is the mac image on the external monitor is cut off like I can't see the white top bar. Any solutions to fix this issue?
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Feb 27, 2009
I have a Macbook Pro 2.16 Core Duo, and I'm wanting to install 10.6, but about a year ago, I cracked my screen to the point that I cannot make anything out on it, and haven't replaced it. Instead, I have just been using it in clamshell mode, which has worked out fine so far. My problem is that I cannot get the 10.6 install to show up on my external monitor.
I searched around, and could only find one other similar thread that just ended with the author putting it in clamshell and having it work fine. When I boot to the install and close the screen, I just get a grey box on my external display with a black bar on either side of it. I can't seem to find any other resources, so I'm not entirely sure what to do at this point. Any help would be greatly appreciated.
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