External monitor not recognizing my MBpro

Until recently I have never had a problem. Not sure what changed. I tried to hook up my laptop to the LCD projector and it did not take. No laptop recognized. The projector recognized a different laptop but not mine. Any ideas?

I have two thumb drives not being recognized by my Mac. I suspect that some of my backed up files from my Open Office program are to blame as this program is windows based. My question is, if I get a large external drive and utilize Time Machine, which will b/u these Open Office files, will the Mac stop recognizing the drive if I shut down or do a restart? If so what are my options?

Similar Messages

External monitor not recognized (X200)

Hi,
I have an X200 with Vista
When I connect an external monitor (or projector) it is not recognized. Shift-F7 results in a message that no external monitor is detected. However, if I leave the monitor connected, put the system in standby and then resume, it recognizes the external display.
Any thoughts to how I can get it to recognize without this work-around? Thanks

I had the same problem. I think it's a vista device driver issue. Try this-
Power down your laptop. Plug in the external monitor. Boot the computer - it should default to the external monitor, and Windows should recognize it. Then, shut down normally.
Pull the monitor cable, boot your laptop regularly, reattach the cable, and give it a try.
It worked for me.

External monitor not recognized!

I have a Philips 180P2 external monitor hooked up to my iMac 2.8 GHz, 24", which was running fine until my upgradte to SL this afternoon. Now (among other little "quirks") the external monitor can't recognize the signal from the iMac ... or rather, the iMac won't display there...
What's odd is that I had, for example, Safari on the external monitor and, when I start that browser, it won't show as it running on the external Philips monitor ... which isn't running (yes, power is on and cable is plugged in). When I unplug the monitor adapter from the back of the iMac it switches to one-display mode again and Safari is shown on the iMac.
The system preferences show the monitor and its position fine ... what's going on?!
Any and all help is REALLY appreciated. Thanks!

I've had similar problems (see http://discussions.apple.com/thread.jspa?threadID=2132912&tstart=0) with my second monitor. When I downgrade the display of the external to 1600x1000, then the internal monitor of the imac to 1600x 1200, the display on the external is not very good. However, if I then revert the external to 1680x1050 and the internal to 1900x1200 I can get both back to what things were before updating to snow leopard. However, when I then switch off the imac for a while and then switch back on again the external switches back and forward between no display and a fleeting glimpse of the desktop.

Yosemite dual external monitors not recognized?

I upgraded my Macbook Air this morning to Yosemite 10.10 from Mavericks. Now, my Mac only recognizes one of my two external monitors. By this I mean that only one of my two external monitors appears in the Arrangement tab of the Display settings dialog box. This setup worked previously under Mavericks though the mouse motion was jerky on the USB monitor. Is this a bug or does Yosemite not support 2 external monitors? The external monitor that works for Yosemite is connected through the DVI port. The one that no longer works is connected through a USB port via an HDMI to USB adapter. I've rebooted my Mac and the monitor several times and tried the second USB port on my Mac. Both monitors are Samsung though they are different models. Suggestions?

Same issue - but I fixed it! I had the same issues with my MBP while running Mavericks. I tried updated to Yosemite (my co-worker runs Yosemite and has no monitor issues) to no avail. It still did not want to acknowledge any external monitors. Finally I did away with the HDMI connections altogether. I bought to DVI to Thunderbolt cords (Cable Matters, Gold Plated) from Amazon and BOOM! Fixed. Both monitors fire right up every time I plug it up.
I know its not a real fix...its still an issue that Apple needs to address, but it seems to be a great way to get around it until they do. Ive been using these cables for a couple of weeks now and still rocking. I hope this helps someone!
A little history for other to compare to.
MacBook Pro (Retina, 15-inch, Refurbished Late 2013)
Scenario 1: Mavericks 10.9.5
                    Monitor 1: HDMI to HDMI
                    Monitor 2: HDMI to HDMI via Mini to Thunderbolt Adapter
Scenario 2: Mavericks 10.9.5
                    Monitor 1: HDMI to Thunderbolt
                    Monitor 2: HDMI to Thunderbolt
Scenario 3: Yosemite Update
                    Monitor 1: HDMI to Thunderbolt
                    Monitor 2: HDMI to Thunderbolt
Scenario 4: Yosemite Update
                     Monitor 1: DVI to Thunderbolt
                     Monitor 2: DVI to Thunderbolt

External monitor not recognized after upgrading to win 10

After upgrading to Windows 10, my external Samsung monitor isn't recognized. Not sure if I need new drivers from HP or Samsung (they say they don't have anything for me, of course).

Hello I managed to solve my problem of brightness key not working by Installing the Intel HD Graphic 3000 Driver from Intel official site. So if your Graphic card is Intel HD 3000 Graphic and your system is 64 Bit OS then you can follow the below link to download it and install.....https://downloadcenter.intel.com/download/24971/Intel-HD-Graphics-Driver-for-Windows-7-8-64-bit Note :- This Graphic driver only support the following intel Processor And If Your Are still running the built in intel graphic card, then only download it and install at you own risk.Supports Intel(R) HD graphics on: 2nd generation Intel(R) Core(TM) i3 processor 2nd generation Intel(R) Core(TM) i5 processor 2nd generation Intel(R) Core(TM) i5 vPro(TM) processor 2nd generation Intel(R) Core(TM) i7 processor 2nd generation Intel(R) Core(TM) i7 vPro(TM) processor Intel(R) Pentium(R) Processor 900/B900/G600/G800 Series Intel(R) Celeron(R) Processor 700/800/B700/B800/G400/G500 Series

External Monitor not recognized when running XP (MDP to HDMI)

Hi,
I also posted this in the "Windows Compatibility" forum.
I have a new Macbook Pro (unibody, 15.4", 2.53 ghz) and I am trying to make it work with my Samsung T260HD HDTV/Monitor. I am hooking this up via a Mini displayport to HDMI adapter, Yeah! I have NO problems when using the computer in OS 10.5.6, but when I boot up into windows XP (SP3) via bootcamp, the monitor gets no signal. I know that it is NOT the adapter, Apple hardware, or monitor, because, like I said, it works fine in OS X. I am assuming that this is a windows driver thing. Anyone have any thoughts or suggestions to get this to work? Thanks.
-Dan

boot windows xp in safe mode with vga drivers to use standard 800x600 display drivers so you can see, then install teh drivers for your monitor.

External Monitor not recognized when running XP

Hi,
I have a new Macbook Pro (unibody, 15.4", 2.53 ghz) and I am trying to make it work with my Samsung T260HD HDTV/Monitor. I am hooking this up via a Mini displayport to HDMI adapter, Yeah! I have NO problems when using the computer in OS 10.5.6, but when I boot up into windows XP (SP3) via bootcamp, the monitor gets no signal. I know that it is NOT the adapter, Apple hardware, or monitor, because, like I said, it works fine in OS X. I am assuming that this is a windows driver thing. Anyone have any thoughts or suggestions to get this to work? Thanks.
-Dan

boot windows xp in safe mode with vga drivers to use standard 800x600 display drivers so you can see, then install teh drivers for your monitor.

Monitor not recognized by Mac anymore?????

Hi
This is big and what is APPLE doing to solve this issue??
I just copy some posts from the forum to show how big this issue is, there is 8 more pages with the same problem, and i am one of them!!!!
HELP!!!! WE ARE FREAKING OUT HERE AND NEED A SOLUTION!!!
Yes, me. I have an HP w2207 who worked with my 3 y.o. old MacBook (OS 10.4.??) via the DVI-port flawlessly. Then bought a brandnew MacBook Pro with 10.6.X and the external monitor stopped being recognized. It works now that I have changed the connection to the VGA-port of the monitor (and bought yet another adapter for the MacBook Pro) but the quality is not what I'm used to.
MacBook Pro Mac OS X (10.6.1) HP w2207 external monitor
MattLTH
Posts: 15
From: Salt Lake City, UT USA
Registered: Dec 4, 2007
Re: External monitor not recognized!
Posted: Dec 1, 2009 1:29 PM in response to: cruzcj
Reply Email
Yes. I've tried 7 different Macs including a MacBook Pro with Snow Leopard (10.6.2) and my external monitor doesn't work with it either.
For me here's a recap:
Installed SL on a Mac Pro connected to a 23" Cinema via DVI and Olevia 537 via HDMI Input #1 and now that input no longer works with Mac computers.
Reinstalled 10.5.8 on the Mac Pro and HDMI #1 still didn't work, so I plugged the Mac into HDMI #2 and it worked.
Reinstalled SL on the Mac Pro connected to a 23" Cinema via DVI and Olevia 537 via HDMI Input #2 and now that input no longer works with Mac computers.
Since then, every device (PCs, DVD Players, Video Cameras, etc...) I connect to either of the HDMI inputs work fine. However, neither HDMI input works with ANY of the 7 different Macs (regardless of OS version) I've tried, except for a 10-year-old G4 running Panther or Tiger.
The monitor had previously worked with the MacPro (HDMI input #1) and a G5 (HDMI input #2) for almost 2 years.
When I plug the MacPro into any other monitor via HDMI, it works fine. Same thing with the G5.
My theory is still that the installer for Snow Leopard somehow made my monitor's HDMI inputs incompatible with Macs. I'm so frustrated that I'm ready to buy a new monitor, but since there's no guarantee that a new monitor won't be adversely affected by Snow Leopard, I'm still dubious.
Matt
MacPro, MacBook Pro, PowerMac G5 Mac OS X (10.6.2)
Stephen Darling...
Posts: 59
From: London, UK
Registered: Sep 24, 2004
Re: External monitor not recognized!
Posted: Dec 5, 2009 8:22 AM in response to: Roger Kaufmann
Reply Email
Another "me too" post...
Not sure exactly when it stopped working (since I don't use it every day) but my Viewsonic VX2455wm stopped working with my MacBook recently too. Checked with another MacBook (six months newer than my Late 2006 model) and that exhibited the same problem. Both machines have fully patched Snow Leopard installs. Both started with Tiger. Mine is regularly connected to the external monitor, the other has never been connected. I'm connecting using a DVI cable and a mini-DVI-DVI adapter.
The monitor appears to work correctly. I've checked with a Windows laptop connected on the VGA port. I want to test with another DVI-enabled machine to see whether or not its the cable.
MacBook C2D 2Ghz Mac OS X (10.6.2) iPhone
cruzcj
Posts: 4
From: California
Registered: Nov 28, 2009
Re: External monitor not recognized!
Posted: Dec 13, 2009 10:38 PM in response to: Stephen Darling...
Reply Email
My wife's 15" MBP arrived on Wednesday. Connected it tonight to her new Dell 23" ST2310 via a MiniDisplayPort to VGA and it works fine.
MacBook Pro 15" 2.8GHz Mac OS X (10.6.2)
Gaston55
Posts: 4
From: Sweden
Registered: Dec 15, 2009
Re: External monitor not recognized!
Posted: Dec 15, 2009 12:06 AM in response to: Roger Kaufmann
Reply Email
Hi Guys
I have the same problem with my new Dell 2209WAf. It worked fine before i changed from L to SL.
I didn't know what happened so i have spend hours and hours to resolve the problem.
Hours with Mac support and friends didn't change anything, i still cant make my Dell to work, or show up in preferences. I am working as a photographer and this issue is a real problem.
I just heard from Mac Support that Apple is working on it.....well, doesn't help us with the problem today.
So Apple, DO SOMETHING ABOUT THIS! NOW! this problem should NEVER showed up, this is something you should have fixed before telling all the Macers to upgrade!!!
Macbook Pro Mac OS X (10.6.2)
RWildman465
Posts: 2
From: Illinois
Registered: Dec 16, 2009
Re: External monitor not recognized!
Posted: Dec 16, 2009 1:18 PM in response to: Gaston55
Reply Email
Experiencing the same issues. However, on bit different hardware.
I'm using the XLR8 ProView USB input devices. Using these devices on a mixture of 10.5.8 and 10.6.2 systems (2 MacBooks, 2 Mac Mini and 1 iMac).
I can confirm the following:
When attempting to mirror video, or extend the desktop, using a mini-DVI to S-Video/Composite device on OSX 10.6.2 no video is sent to the mini-DVI device (inputing into the XLR8).
When attempting to mirror video, or extend the desktop, using a mini-DVI to S-Video/Composite device on OSX 10.5.8 video is sent to the mini-DVI device (inputing into the XLR8).
Let me also state, that the mini-DVI port on the Mac Mini's do work. They have been connected to 19" monitors and working without issue. Today, the mini-DVI devices were replaced with minidisplay port devices, which are use in conjunction with the mini-DVI ports.
It would appear, in my case, that the problem is that the mini-DVI port on both the MacBook and Mac Mini, running 10.6.2, as a secondary display device is not operating properly.
iMac Mac OS X (10.6.2)
Todd Camp
Posts: 2
From: Chicago
Registered: Dec 19, 2009
Re: External monitor not recognized!
Posted: Dec 23, 2009 12:41 PM in response to: RWildman465
Reply Email
Same problems here. I reloaded OS 10.4.6 which is what shipped with my MBP1,2 17" 2.16 Intel Core Duo 2GB ram and after installing that, i was able to select 1920x1080 for my external HP w2338h, DVI-VGA, never been able to connect DVI-HDMI. On SL, the max rez I was able to "use" was 1600x1200 which looked horrible. So this leads me to suspect that this must be an issue with SL.
I spoke with Apple Tech support on Sat and was no help. The only suggestion was that I take my MBP and Monitor to the Apple Store. Those of you who are fortunate enough to live in Chicago in the winter, then you know that option really isn't that feasible, it is but just a giant pain.
Early 2006 MBP 17" Mac OS X (10.6.2)
Salm0n
Posts: 1
From: Minneapolis
Registered: Dec 27, 2009
Re: External monitor not recognized!
Posted: Dec 27, 2009 9:57 AM in response to: Todd Camp
Reply Email
I have an iMac 9,1 Intel Core 2 Duo that I bought last June. It came with Leopard, but I upgraded to Snow Leopard. Currently, it's running 10.6.2. My HP w2207 Widescreen monitor works perfectly with it using the DVI port on the HP and the mini-display (not mini-DVI) port on the iMac.
However, I just bought the top-of-the-line iMac 11,1 Intel Core i5 QuadCore three days ago and it crashes nearly every time that it wakes from "sleep" when the HP w2207 is connected to it. It doesn't even recognize that the w2207 is connected to it. Additionally, when the w2207 is connected, it (a) looks terrible - very dim and very granular, and (b) causes the iMac QuadCore to operate very sluggishly. When I disconnect the HP w2207, the iMac QuadCore is lightning-fast.
Much like my older iMac, the QuadCore is running 10.6.2 and I'm using the mini-display port.
iMac 11,1 & iMac 9,1 Mac OS X (10.6.2)
Marjorie Colletta
Posts: 20
Registered: Mar 17, 2005
Re: External monitor not recognized!
Posted: Jan 6, 2010 6:07 PM in response to: Roger Kaufmann
Reply Email
This is a Me too post, I have a MacBook and NEC Multisync Monitor that worked fine before I upgraded to 10.6.2. I've tried to get it to work without any luck. I've written NEC to see if they have a solution.
MacBook 2 GHz Intel Core 2 Duo Mac OS X (10.6.2)
davej147
Posts: 12
Registered: Jun 1, 2006
Re: External monitor not recognized!
Posted: Jan 11, 2010 6:24 AM in response to: Roger Kaufmann
Reply Email
Another me too post. I have a new 17" MacBook Pro with 10.6.2 installed. Trying to connect to an HPL2245wg - sometimes it works flawlessly - other times not at all. Some mornings I spend 30 -40 minutes rebooting, unplugging and plugging the monitor, Detecting Displays, changing the Graphics Card (Energy settings) - all to no avail. Very, very frustrating Apple - please figure out what is going on with this issue....and get it fixed!
17" MacBook Pro Mac OS X (10.6.2) Very happily gave all my XP-stuff away!
Anteck
Posts: 2
From: Australia
Registered: Sep 30, 2009
Re: External monitor not recognized!
Posted: Jan 20, 2010 2:31 PM in response to: Roger Kaufmann
Reply Email
Wow, me too. Did a minor software update (apple released it) last night, got on this morning and BANG - my main 24" Dell display is NOT working.
This is ******, apple have surely f**ked up here. It's never had a hitch, ever, since i bought it 9 months ago.
We are all reporting the same thing - software update, and then no working external display...
APPLE???
Macbook Pro 2.2 15" Mac OS X (10.6.2)
Zedog
Posts: 13
Registered: Aug 10, 2006
Re: External monitor not recognized!
Posted: Jan 20, 2010 2:59 PM in response to: Roger Kaufmann
Reply Email
I seem to have found a fix for myself. I was having terrible issues with the screen blinking and flickering constantly. I tried to reset the SMC with everything unplugged and the computer would not reboot at that point on it's own which led me eventually to reinstalling SL.
Reinstalling SL is quite painless actually as it installs on top of your profile. After reinstalling I ran software update which installs the cumulative upgrades. Now I usually don't have any problems but must follow the instructions to run in clamshell mode to the letter.
After a week of running in clamshell mode I started having an issue with the dock not lining up so I put the computer to sleep, disconnected the monitor and restarted with nothing connected. After that, followed the clamshell mode instructions again and have been working fine again all week.
I've also disabled my screen-saver, and deleted the windowserver preferences as part of my debug process but not sure if that has contributed to my new found stability.
http://support.apple.com/kb/HT3131
Mac OS X (10.6.2)
pragmaik
Posts: 2
From: Duisburg
Registered: Apr 16, 2008
Re: External monitor not recognized!
Posted: Jan 21, 2010 1:08 AM in response to: Roger Kaufmann
Reply Email
Me too. I have a MacBook Pro 2,2 running the latest Snow Leopard 10.6.2. After I have installed yesterday's security patch it does not recognize external displays on the DVI port any longer. Tried it with a 23" DELL at the office and a 23" Samsung at home. Both have worked without any problems for years.
I am curious to learn how this behavior is related to security...

Gaston,
This is not the correct Feedback venue for your issue.
Please select an appropriate product from those displayed HERE and use the corresponding form to communicate to the correct department.
ali b

No video to second external monitor but recognized by system

When I connect two external monitors(22 inch AOC) using mini display adapters to VGA or USB to VGA adapter from my MacBook Pro (Retina, 15-inch, Late 2013) with an Intel Iris Pro 1536 MB graphics driver and recently updated to OS X Yosemite Ver 10.10, I only have one of the external monitors showing a picture, the other is a black screen. When going to 'Displays' through settings both external monitors are recognized and shown. I can arrange them how I want. When going into 'About this Mac' and selecting 'Displays' both monitors are displayed as active. No matter which port I use and no matter which monitor I switch around it is always the same. One monitor dark and the other working but both always recognized by the system. Any ideas for me? Thanks

Hello iorjim,
Thanks for using Apple Support Communities.
To troubleshoot this issue where you are not seeing a signal on your secondary display, I'd like you to please follow the steps in the article below in the "No video or no signal" section.
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Cheers,
Alex H.

External USB not recognized on my iMac (intel) in Disk Utility, Finder as well as in Terminal diskutil list but is listed in System Profile, which includes the location ID of 0xfa400000 / 5. Can the location ID be used to restore USB identity ?

My 1TB Seagate external USB not recognized by my iMac (intel) in Disk Utility, nor in Finder as well as in Terminal "diskutil list" but it is listed within the System Profile, which includes the location ID of 0xfa400000 / 5. Can the location ID be used to restore the identity of my external USB ?

Hello JNotorious,
Thank you for using Apple Support Communities.
For more information, take a look at:
USB and FireWire Quick Assist
http://support.apple.com/kb/ht1151
Have a nice day,
Mario

N570GTX M2D12D5 Dual monitor not recognized

N570GTX M2D12D5
Windows 7 64 bit
Two monitors connected to DVI outputs
Second monitor not recognized by Windows 7 or NVIDIA Control Panel
Not found by Rigorous Display Detection either.
Does something else have to be set to get this card to enable 2 displays?
MMc

remove current vga drivers in safe mode with >>Driver Sweeper<<
then install 270.51 from nvidia web page and see how its goes

External LG monitor not recognized by MBP

I've been using an LG Flatron L22WTG external monitor with my MBP (purchased 2011) running 10.7.2. The monitor worked fine until recently and now is not recognized by the MBP and goes into "power saving mode". There is no response when I press "recognize monitors". Tried the settings for power saving and monitors. This issue is recent, but I don't know if it occured with my recent installation of the last Lion patch.

Me too, but my LG monitor just stopped working after I installed the recent "Thunderbolt Firmware Update".
Literally the monitor was working yesterday. This morning I installed the update and now it's broken. Great update.
Anyone have a fix?

External Monitor not Reconized

I have a 27", mid 2011 iMac OSX 10.9.1 and a ViewSonic monitor. I purchased a Thunderbolt to VGA video adapter cable and connected the external monitor. I'm getting nothing. It's not being recognized at all.
I've tried clicking detect display, arrange monitors, I've reset the PRAM. I've even purchased a different cable and that didn't work either. Any suggestions?

Hello meattray,
The following article provides steps that can help get your display working with your iMac.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
Cheers,
Allen

External Monitor Not Working after Mavericks upgrade

I just upgraded to Mavericks and my USB external monitor & VGA external monitor is not being recognized.

I just upgraded to Mac 10.9.
My Sony KLV-32S300A LCD HDMI TV is no longer recognized as external display (neither in mirror nor in 2nd window mode).
External display used to work flawlessly under Mac 10.8.5.
My hardware: MacBook 13-inch, aluminum, late 2008.
So far I have found no workarounds.

W520 external monitor not connecting properly

W520, Windows 7 (64 bit), NVIDIA Quadro 1000M 2GB DDR3, purchased November 2011. External monitor: HP 2511x.
Haven't been able to find this issue in a previous thread.
In Optimus (preferred) mode, when I plug an external monitor VGA, HDMI or DVI (via displayport) cable into the laptop or mini dock, the laptop LCD goes completely dark (black). This happens whether the external monitor is turned on or off, for the VGA and HDMI plugs. If the external monitor is turned off when the displayport plug is inserted, nothing happens: the laptop screen stays on, but when the external monitor is turned on, with the displayport plug in use, the laptop LCD goes dark.When the plugs are removed, the laptop LCD comes back on, except when the displayport plug is removed (then, the laptop screen stays dark).
In all cases, the external monitor is not recognized by the laptop, and if turned on at the time (the external monitor), shows a message which reads that it is going to sleep.
Device Manager shows the Intel and NVIVIA display adapters and does not show the external monitor (because I cannot hook it up without darkening the laptop screen).
A few months ago I had the Optimus arrangement working, using the NVIDIA control panel to set up a clone mode. The external monitor worked beautifully. Then I disconnected from the external monitor for several weeks, and now it will not work.
The external monitor was used until very recently on a separate PC, which I no longer have, and the external monitor driver was reloaded this morning.
I welcome sugestions on how to plug into the laptop without causing the laptop screen to go dark, which I think would then allow me to set up the external monitor as desired.
Thanks,
RR

But did you RUN the nVidia driver file that you downloaded??? It is an EXE, and you must RUN it after downloading.
The fact that your Device Manager -> Display Adapters still shows "Video Controller(VGA compatible)" specifically tells us that you have NOT YET INSTALLED THE CORRECT DRIVER FOR YOUR VIDEO CARD!!! You are still running with the vanilla generic Microsoft VGA drivers which will work generically and support only minimal capability for EVERY SINGLE VIDEO CARD MANUFACTURED. It doesn't support all of the capabilities of the K1000M.
YOU MUST ACTUALLY RUN THE DOWNLOADED DRIVER INSTALLATION FILE EXE, in order to perform the process of actually installing the driver for your "Video Controller(VGA compatible)" device, which of course is really the K1000M.
Once that driver is correctly installed, it will now appear as "NVIDIA QUADRO K1000M", instead of "Video Controller(VGA compatible)" as you currently show.
The reason your desktop icons are currently very big, and that everything else is currently very big/enormous, is because your desktop resolution is not set correctly... although it may be set as high as it can go for the moment. Only when you finally install the true nVidia driver will your default resolution be presented at what the hardware monitor "recommended" resolution should be, which is likely at least 1920x1080 if not 1920x1200. Then everything will appear "normal size", and at the very least will not appear to be ENORMOUS as you currently see.
Also, I'm expecting that once you get the correct nVidia driver installed for the K1000M that your external monitor will now work perfectly, and will not black out.
So... even while you're still using the current vanilla generic MS VGA driver (although again, your mission is to install the nvidia driver for your K1000M), just right-click on the desktop and select "screen resolution" from the popup menu, to get the "screen resolution" dialog window.
Then click in the "screen resolution" dropdown list to get a dropdown (with a slider) offering you to change resolutions. Pull the slider up to whatever you want and click, and then push the OK button. You'll then be offered a confirmation dialog window allowing you to click OK or CANCEL within 15 seconds to accept the resoluton change. Click OK to keep what you just set.
Your desktop icons and everything else will now appear smaller (or at least "normal"). Temporarily, you've got things satisfactory at least.
But you'll do the same thing again AFTER INSTALLING THE NVIDIA DRIVERS. This time the dropdown "screen resolution" list will have a slider whose top value will show "recommended", and will probably be 1920x1080 or 1920x1200. Pull the slider all the way up to that value and click. Then again, push OK, and OK to the confirmation.
Again, your absolute test goal is to see "NVIDIA QUADRO K1000M" in Device Manager. You should NOT BE SEEING "VIDEO CONTROLLER (VGA COMPATIBLE)".
The installation of the nVidia driver will also get you "nVidia Control Panel", where you can then perform additional customizations, such as whether or not you want to use BOTH the laptop screen as well as external monitor configured in either "laptop screen only", or "clone mode" (i.e. duplicate of single desktop on both screens), or "extended mode" (i.e. double-wide desktop extending across both screens), or "external monitor only," (with laptop screen dark).
Again... YOU MUST RUN THAT DOWNLOADED NVIDIA DRIVER INSTALLATION FILE EXE. It doesn't run itself, unless that's what you have set in your browser when offered the choice of RUN or SAVE. But if you SAVE it, then you must yourself manually run it after the download completes.
IT MUST BE RUN TO INSTALL THE DRIVER. Then you'll see "NVIDIA QUADRO K1000M" in device manager. Until and unless you see that value, if you still see "VIDEO CONTROLLER (VGA COMPATIBLE)" then you have NOT YET DONE WHAT YOU NEED TO DO.
Understood?

External monitor not recognizing my MBpro

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