Detect external Monitor

My Sprectre X360 does not detect my SyncMaster 2493HM Monitor using an HDMI cableIt does detect a newer Samsung monitor using HDMI

Snip wrote:Is it possible to have a script executed when I connect/disconnect my external monitor to my laptop (using a VGA cable)? I want to automatically execute xrandr to enable the external monitor and disable my laptop screen as soon as the cable is plugged in, and the other way around when it's unplugged. I can do it manually using the hotkey, but I'm just wondering wether this is possible as well.
On a EEEpc I have:
CRT=`xrandr | grep "VGA1 connected"`
if [ "x${CRT}x" != "xx" ]; then
xrandr --output LVDS1 --off --output VGA1 --mode 1680x1050 --pos 0x0 --rotate normal
fi
This has to be calibrated to the particular case, the value is not necessarily 'VGA1'.
And it will probably not work with the proprietary nvidia drivers.
Mektub

Similar Messages

My imac will not detect external monitor after recent update. Is there a way to fix this?

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.
Any ideas how to fix this?

Pcantin wrote:
I have tried another VGA monitor and that failed as well. Since you don't think the update was the cause, it may be that the adapter I am using decided to call it quits. I will see if I can find another and test that out.
I will look into the external drive idea as well.
Thanks for your help on this.
I didn't think about the adaptor, but you should at least visually inspect both the adaptor and the cable at both ends. If one or more pins got bent even slightly the connection might fail. The cables can also fail internally. Replacing the adaptor and cable may be the quickest thing to do initially. If you want to try to save money, first replace the adaptor, and if the problem persists, then go replace the cable (or vice versa).

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.

How to get new Macbook Pro Retina (late 2013) to detect external monitor via HDMI?

Hi everyone, this is my first Mac and for the most part it's been really, really wonderful.
This is my first major glitch: I cannot get it to detect my external display: It is an ASUS PA248Q, manufactured Aug 2012.
The HDMI cable according to my Amazon history is at least 1.3c from 2010, "Fanatic Digital Imperial Series Gold-Plated HDMI Cable (6 feet)".
It works with perfectly connecting an AmazonTV box to an old Samsung TV, with vivid clarity, unlike our cableTV signal.
Just in case, I have a new HDMI cable on order, which claims to be of newest standards.
The Macbook Pro Retina (late 2013) has the standard Intel Iris from the Haswell chips, as well as Nvidia GT 750M, the latter which I don't think has been used yet.
The ASUS display says: HDMI NO SIGNAL.
I have tried shutting them down and replugging the cable. I don't know what the ideal order is. The Macbook Pro is plugged into AC power, as suggested.
In System Preferences>Display, I press the Option key to select "Detect Displays" option (seriously unintuitive).
I have also tried resetting the NVRAM:
I shut the machine down. Pressed the power button, then quickly held the quadruplet: Option-Command-P-R (a double handful) and waited for the machine to chime a 2nd time. Tried to detect external display no luck.
Next, I reset the SMC:
I shut the machine down. Then I pressed Shift-Control-Option-Power for about 5 to 10s. Then I turned on the machine normally.
NVRAM & SMC steps were from an old youtube video, as the instructions I had did not explain how to do so clearly.
Please let me know if I"m doing something wrong.
Seems so exorbitant to pay $350 for Apple Care; that's a the cost for a whole new cheap laptop.
I will search the forums again. If anyone answers this, thank so much!

Hello there, willr314.
It sounds like you've covered most of the practical steps found in this Knowledge Base article:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573#1
No video or no signal, image distortion, "snow," or flickering
Check connections
When using an external display be sure to check the following:
If you're using an Apple notebook, confirm the AC power cable or adapter is securely connected to the computer and the cable providing power to the display is also secure. It is always good to have your notebook connected to AC power when an external display is in use.
Confirm display adapters are fully seated in their respective connections and that they are supported models and for the computer and display. Refer to these articles to assist you with adapter compatibility and further configuration information:
Monitor and Display Adapter Table
About Mini DisplayPort to HDMI adapters
Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
Thunderbolt ports and displays: Frequently asked questions (FAQ)
Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved.
Try unplugging the video adapter or cable and then plug it back in.
If more than one video adapter is in use (or "daisy-chained"), troubleshoot by using only one adapter.
Example: A mini DisplayPort to DVI adapter connected to a DVI to HDMI adapter is an unsupported configuration because there is a series of adapters in use.
If available, try using a different display and or adapter (or use a different connector by using DVI instead of VGA, for instance).
Reset the system
You can reset the Mac's parameter RAM and SMC.Reset the resolutionStart by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:
Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
Choose Displays from the View menu to open the preferences pane.
Select any resolution and refresh rate that your display supports.
Restart your computer.
The article does offer some additional links and recommendations as well:
These articles may offer additional assistance and information about displays and video adapters:
Apple Portables: How to use your computer in closed lid mode with an external display
Apple Cinema Display (30-inch DVI) has 1280 x 800 as the maximum available resolution
Mac Pro (Early 2009), Mac Pro (Mid 2010): Supported display configurations
For assistance with Retina displays, please see Frequently asked questions about using a Retina display.
If you tried all of these steps for your display and the video issues persist, contact Apple technical support or take your Apple computer to the nearest Apple Store or Apple Authorized Service Provider (AASP) for diagnosis. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available in some countries only).
Note: Diagnostic fees may apply for issues not covered under warranty or the AppleCare Protection Plan (APP).
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

Macbook Pro detects external monitor as TV

Hi,
I recently purchased a new MacBook Pro with Retina display. I plugged in an external monitor for the first time today and noticed that the screen looked blurry. I have seen on other forums that its a font smoothing issue but I ran that command in the terminal with no sucess. In my case its just not the font that is blurry, everything is blurry. I believe the problem is stemming from OS X detecting my external monitor as a television. Is there anything I can do to fix the issue or am I stuck waiting for Apple to update their video drivers. As a developer I like having as much screen space as possible but reading text on the secondary monitor is giving me a headache its so blurry.
My external monitor is a 24 inch Samsung with a max resolution of 1920x1080. I am connecting it via the Apple mini display port to DVI adapter.

It was set to 1080p, 1920x1080 did not show up as an option (even when holding the option key). 1080p should be equivlant. As as experiment I grabbed another monitor that was not being used. It is a 22 inch LG with a maximum display of 1920x1080, and its currently set to 1920x1080. The issue is a little different, was not detected as a TV this time, but the screen still looks blurry. There may be some improvement but not much.

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.

Can't detect external monitor, shows only 640x480

Hi,
I'm using a Macbook Pro Unibody 13" 2.53GHz to connect to a Dell 2408WFP external monitor. It worked FLAWLESSLY with my old Macbook Pro using a DVI cable.
1) I first bought the infamous mini-Displayport to DVI adaptor. It didn't work (red static etc. check the page of this product on Apple's store website : you'll see it's a known issue). Cost me 35$
2) I then bought a mini-Displayport to Displayport cable. Thought it should work perfectly. It DOES NOT. The Macbook is apparently UNABLE TO DETECT my Dell and gives it a default resolution of 640x480. Which is ridiculous knowing that the Dell 2408WFP is capable of displaying 1900x1200.
It's really a pain. Does anyone know about this problem or have an idea how to solve it?
Thanks,
P.

Ok,
It was neither the cable nor the computer (thanks Apple). It was the monitor's EDID profile. Dell's problem.
There's two ways to fix this. 1) It is possible (I did it) to create a custom profile using SwitchResX. You'll need to hook up your computer to the monitor using a working connexion (I used DVI) and then use the "export" function in SwitchResX. It will give you a text file. In it you'll have enough data to fill SwitchResX' form to setup a custom profile. You'll then need to restart the computer, hook it with the Displayport cable and try to use this custom EDID profile. It worked for me.
For example (and hoping it will help others) here are the data you need to setup a custom profile for the Dell 2408WFP :
Descriptor #0 - Timing definition:
Mode = 1920 x 1200 @ 59,950Hz
Pixel Clock............. 154,00 MHz Non-Interlaced
Horizontal Vertical
Active.................. 1920 pixels 1200 lines
Front Porch............. 48 pixels 3 lines
Sync Width.............. 32 pixels 6 lines
Back Porch.............. 80 pixels 26 lines
Blanking................ 160 pixels 35 lines
Total................... 2080 pixels 1235 lines
Scan Rate............... 74,038 kHz 59,950 Hz
Image Size.............. 519 mm 324 mm
Border.................. 0 pixels 0 lines
Sync: Digital separate with
* Negative vertical polarity
* Positive horizontal polarity
2) Of course, you can call Dell and tell them about it. They are sending me a THIRD replacement monitor for this. Be prepared when you call them : I spoke with two representative (and among them a "senior technician") who DIDN'T know what was a Displayport. They even tried to sell me the idea that 640x480 is the native resolution for Displayport. It was hilarious. Really. I got them to look it up on Wikipedia.
Case solved. Apple 1 - Dell 0.
P.

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.

15" MacbookPro won't detect external monitor.

I have a MacbookPro and a Samsung external monitor. I have them set up and ready to roll but my MBP wont detect the external monitor, so I can't get the screens to share. Please help me with how to detect and configure this.

Try resetting the PRAM and the SMC, in that order:
http://support.apple.com/kb/HT1379?viewlocale=en_US&locale=en_US
http://support.apple.com/kb/HT3964

IMac 24" could not detect external monitor (early 2009 model)?

I am trying to add a second monitor to my iMac through the mini Display port with a mini-Display to VGA convert cable, somehow my iMac could not detect the second monitor at all on the preference-display menu. After connected the cable and an external monitor I restarted iMac a few times, the external monitor still could not be detected.
Any suggestions? Any simple method to test if the mini Display port is working properly? My iMac OSX 10.8.5
Thanks
David

Hi,
Just tried another miniDisplay - VGA cable, it works! No need to restart iMac. Immeditely I can bring display windows to the second monitor, say, a DVD movie play to the second monitor while working on the main iMac monitor for other tasks.
David

MacAir not detecting external monitor. 'check signal cable' error

Brand new MacAir OX 10.7.4 not detecting samsung external monitor. I keep getting 'check signal cable' error on a blank screen.

Hi Walter,
I'm not sure this'll fix your problem, & it's info from earlier OSX versions, but I'll toss it out...
Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions...
Trash these files...
/Users/YourUserName/Library/Preferences/ByHost /com.apple.windowserver.<12digitHex#>.plist
/Users/YourUserName/Library/Preferences/ByHost/.GlobalPreferences.<12digitHex#>. plist
There may be more than one of each of the above, then trash...
/Users/YourUserName/Library/Preferences/com.apple.systempreferences.plist
Reboot
You could test it by first, depending on OS version...
To find out if it's system wide or user specific, try this...
Open System Preferences>Accounts, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.
Does it work in the new account?
To find out if it's system wide or user specific, try this...
Open System Preferences>Users & Groups, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.
Does it work in the new account?

MacBook Air 2008 detects external monitor while not connected to one

When I put my MBA to sleep and wake it up, it detects and displays an external monitor. I checked the Display section in About this Mac, it shows that I'm connect to an external monitor when I'm not, and that I'm operating on Desktop 2. This is quite an issue due to a noticeable drop in performance and battery life. Has this happened to any one else? If so how did you fix it?

You wanted Extended Desktop, instructions on how to configure that are outlined in this article -
http://support.apple.com/kb/HT5019

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

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.
Recommended highly!

Doesn't detect external monitor

Hi, I'm trying to connect my Imac to my tv (sony) but when i connect o dont get the blue screen, it's like my imac doesnt detect the monitor, but on the tv the HDMI port becomes active, no picture or anything.
I tried my Imac using my friends tv (samsung) and there were no problems,
Has anyone heard of this problem or anything like it?

Just to be perfectly clear, you are connecting to the Dell from the Mac using a DVI port on the Dell, not a DVI to VGA cable, right?
So if you hot plug the cable, meaning both the Mac and the Dell are switched on, the Mac doesn't react at all to this? If that's the case, I would suspect a bad cable, bad adapter or a bad connection somewhere. You might also have to manually switch the Dell from looking for a signal over its VGA input to looking for a signal over its DVI input. There may be a front panel button labeled SOURCE for this, or else you may have to go into the Dell's menu system to make the switch.

Detect external Monitor

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