Why the Slowdown with External Monitor?

I have a new Retina iMac with a 4 Gig Core i7 processor, 32 Gigs of RAM and 4 Gigs of VRAM and the AMD Radeon R9 M295X chipset. My 3 TB hard drive is well under half full. Everything works great . . . until I attach an external monitor.
I've attached a Dell 2815Q via one of the thunderbolt ports on my iMac into the Dell's DisplayPort. The connection is with a cable, supplied with the monitor.
All computer functions are so painfully slow, it becomes barely usable. Finder functions--moving windows, mouse operations are like molasses. Scrolling is so bad that reaction time is near 5 seconds and then it continues to scroll after the physical mouse gestures cease.
Why is this so sluggish? I would have thought with the processing power and video capabilities of my new iMac that this problem would not occur. When I disconnect the Dell, of course, everything is speedy again.
Is there anything I can do to fix this? The Dell provides beautiful images, but it is virtually worthless with the slowdown in speed.

The warranty entitles you to complimentary phone support for the first 90 days of ownership.
If you bought the product in the U.S. directly from Apple (not from a reseller), you have 14 days from the date of delivery in which to exchange or return it for a refund. In other countries, the return policy may be different. If you bought from a reseller, its return policy applies.

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Using the GT70 with external monitor and lid closed

I wasn't sure where to post this question.
I have several laptops and use external monitors. I close the lid on the laptops and the display continues to work.
On the GT70, the system shuts down. It won't allow me to use the external keyboard and mouse or display the session.
Any suggestions if there is a configuration option to allow the GT70 to continue to function with external monitor and lid closed.

Yup. This is a windows setting. You need to go into your control panel -> power options -> "Choose when the computer sleeps" and "Choose what closing the lid does"
That should solve the problem. I currently have my GT70 hooked up to a 42" TV and I can close the lid and it stays on and the TV continues displaying as well. No problems. =]

MacBook Pro won't stay asleep with external monitor attached. When sleep is selected from the Apple menu the computer will go to sleep only to continually wake up...go back to sleep...wake up...etc. every few seconds.

MacBook Pro won't stay asleep with external monitor attached. When sleep is selected from the Apple menu the computer will go to sleep only to continually wake up...go back to sleep...wake up...etc. every few seconds. This only happens when using the external monitor. Does anyone have any suggestions?

Mine does that too. The worst thing is when it goes to sleep, then wakes up and keeps running while the lid is closed and it is wrapped up in a case. I am afraid when the hot weather comes it is going to burn up. I am hoping Apple fixes it in the software or they may have a melted MBP to replace.
Then when I open the lid it is crashed running at fill tilt, pumping out heat to beat the band. I am forced to hold the button down and reboot.
I wiped my hard disk and reinstalled my OS, but it didn't help. I reversed my OS to 10.5.0 and it solved the DVI problem but still won't sleep. This post will probably be deleted by Apple, they did it a few days ago. I just don't know what to do, and I consider myself a real Apple expert. Just hoping you realize you are not the only one.

HP Pavilion DV6; Black Screen & Atikmpag.sys BSOD with external Monitor

Hello Guys.
I have HP Pavilion DV6 Core i7 with ATI Mobility Radeon HD 5650 Graphics Card. Two weeks ago, I started getting continous Atikmpag,sys BSODs. The operating system also started giving me warnings about the hardrive. After a few days, the BSODs got more frequent. Then one day, I was doing normal stuff on my PC and the Display Driver crashed. Instead of recovering, the PC froze. I forced restart my PC but it got worse. The display of my laptop went black. I connected the laptop to external monitor which detected the display. When I tried to load the windows, it started giving me the Atikmpag.sys BSOD on the start up. Now the operating system works fine in the Safe Mode but with nothing on the laptop's screen. The soultions I have tried so far are.
-Reinstalled the windows thrice
-Removed the drivers and installed the updated ones a bunch of times.
-Rolled back the bios to an earlier version
-Removed the hardrive and tried to load it from an operating system installed on external flash drive
-Tried loading the PC with linux on external flash drive
-Opened the laptop and cleaned it thoroughly
-Removed all the components and plugged them one by one.
-Removed the old Atikmpag.sys in system32 folder and expanded it with the latest ones.
-Installed every thing fresh from HP website
None of these tricks have given me any luck yet. The only way, I could use the operating system in normal mode, is to delete the atikmpag.sys file in safe mode and then log on back in normal mode. I also analysed the minidump file through window debugger and it says that atikmpag.sys is causing this crash with the TDR message. I did all these with an external monitor as the display of the laptop is black since that day.
Below are the detailed specs of my laptop.
OS Name: Microsoft Windows 7 (64 bit) Home Premium
Version: 6.1.7601
System Model: HP Pavilion Dv6 Notebook PC
Processor: Intel Core i7 Q 721 @ 1.60 GHz
Bios Version/Date: Hewlett- Packard F.29, 11/7/2011
Installed Physical Memory (RAM): 6GB
Graphics Card: ATI Mobility Radeon HD 5650 1 GB
I have tried almost every solution available on these forums but still have not gotten any where. I am wondering how could the display, graphics card and hard drive stop working at the same time .
I would really appreciate if someone colud help me through this problem.
Thank you
P.S. Kindly ignore my English mistakes as it is not my first language.

Hi Goloono,
Welcome to the HP Forums!
I would like to take a moment and thank you for using the forum, it is a great place to find answers. For you to have the best experience in the HP forum, I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
First I would like to reassure you your English was great, I had no problems understanding you.
I grasp that you are getting a black screen with the error message " Atikmpag.sys".
Here is a link to Troubleshooting Error Messages on a Black Screen that may Occur During Startup or Boot.
Have you run The HP Support Assistant to help with updates and resolving issues.
Here is a link to a Microsoft Community Page with this exact issue. There are some suggestions that may help.
Blue Screen error with atikmpag.sys in Windows 7 .
Here is a link to the HP software and driver page. You will need to input your exact model of DV6 you have and follow the prompts. This page will have the recommended drivers and it will list bios updates. if there are any applicable ones.
HP Drivers & Downloads.
How Do I Find My Model Number or Product Number?
At one point you state you had a hard drive error, to rule that out I would run a diagnostics. SMART Media Test Error Appears when Notebook is Started
Please let me know if this has helped.
Sparkles1
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

Yosemite: Turning off Macbook Pro screen (lid open) with external monitor connected

Here we go again, this worked pre-Yosemite. Now it seems this trick no longer works. After following these steps again the screen on my Macbook Pro now turns on after logging in and opening the clam shell.
Anyone figure out/know a way to turn off the screen on the Macbook Pro with external monitors plugged in? (yes, closing the clam shell–but I'm referring to keeping the clam shell open with the display turned off)
http://gizmodo.com/5938452/a-trick-to-make-using-an-external-monitor-with-your-m acbook-way-better
To execute in Terminal:
sudo nvram boot-args="iog=0x0"
To undo in Terminal:
sudo nvram -d boot-args
Once you type it into terminal I believe you need to enter your password. I then restart my machine. Now the TRICK is to either restart your machine with the lid already closed (hit restart then slam the lid!) OR turn the machine on for the first time (then quickly slam the lid!) once you are past the login screen you can open the lid.

Has anyone experimented with tip 2 (active corners)? Perhaps it still works.
http://www.cultofmac.com/176329/turn-off-internal-lcd-display-of-your-macbook-ai r-os-x-tips/
Κοσμά τι λες; Τα έχεις μπερδέψει. Άλλο συζητάμε εδώ. Το ότι δεν μπορείς πια να δουλεύεις μόνο με την εξωτερική οθόνη (να έχεις σβηστή την ενσωματωμένη οθόνη όταν έχεις συνδεμένη εξωτερική).

Mountin Lion has trouble with external monitors

Not so much a question as a shout-out. Since going to Mountain Lion, my pretty new (February this year) MacBook has been having no end of trouble with external monitors. I use it a lot with the clamshell closed with two different external monitors of two different sizes, one at home, one at work. It sometimes thinks the one is the other, or if I unplug the monitor in sleep, when I later open the clamshell, the screen stays black and I have to force a reboot with the power button. Never had these problems with exactly the same set-up in Lion. Sometimes it also refuses to find a connected monitor or projector, I have to pull the dangle and put it in again.

If memory serves, one of the 'flaws' with BM's hardware is that it will not convert on-the-fly. So if your sequence doesn't match what the TV is accepting, you get black.
For example, my TV will not accept 1080p, only 1080i, so working in a 1080p sequence would produce no image for me as the BM will only output exactly what's in the sequence, it can't convert my 1080p/24 sequence into 1080i/30 for output.
Now I'd expect your TV would have no trouble accepting a 720p signal but, maybe the above data will lead you down a path of investigation.

MacBook Pro with external monitor and keyboard.

Hello, everyone.
I've tried to find the answer for this question but haven't found a clear answer with my Google search.
My older Powerbook G4 will not allow me to work with an external monitor and keyboard with the screen in a closed position. I am about to purchase a new MacBook Pro and would like to be able to use it at home with a larger monitor and keyboard but with the lid closed and its built-in screen turned off. Can this be done ?
How can a MacBook Pro be used (turned-on) with external monitor and keyboard while the lid is closed and the its screen is off ?
Thank you in advance for your answers.
Joseph

Hi Niel,
I have the same problem with my MacBook and I followed the instructions you posted. My issue is that when the computer wakes up after clicking the buttons on the keyboard it then quickly goes back to sleep. I can't seem to keep it awake when the lid is closed. I've been searching for an answer without any luck. Any idea how to solve this problem?
Thanks!
P.S. After I finished posting this message I figured out my problem. While fiddling with my computer and monitor, I inadvertently disconnected the power. After reconnecting the power, I was able to wake my computer and keep it awake. A note to other people having this issue: the computer must be connected to a power outlet to run in closed mode.
Message was edited by: qwertyphd

Can I use MacBook pro A1211 with external monitor, screen has died but

CCan I use MacBook pro A1211 with external monitor, screen has died but computer seems fine

Hmm seems like this model has DVI out. You could just plug a standard DVI monitor into that. Or use the DVI connector (VGA supported with included adapter; S-video and composite video supported with optional adapters) adapter that came w/ your machine.

Problem connecting U310 touch with external monitors/projectors/TV

I spend almost 80% of my day in front of laptop or computers, running simulations, preparing ppts or report.
Liked the looks and light weight of the LENOVO Ultrabook U310 touch laptop so much, that I ended up buying it.
Except for look and light weight the laptop and LENOVO have turned into a big disappointment.
Found the laptop extremely slow.. on top of it, the LCD hinge broke down within few weeks.
The latest problem is with connecting external monitors or projectors. The laptop connects external monitors only if I uninstall driver and reinstall it. The connection is again lost if I reboot, and the driver again needs uninstalling and Reinstalling to connect any external monitor. Appreciate any suggestions
Best,
Sudhir

Could be your TV is using DVI-I and apple adapter
using DVI-D.
Hope this link provide information you need:
http://www.datapro.net/techinfo/dvi_info.html
Looking at the photos provided in this link, here is the details of what I´m using :
- standard mini-DVI to DVI-D Dual Link (provided by Apple)
- connector on the TV is DVI-I Dual Link
- cable provided by LG with the TV is DVI-D Single Link
Reading the comments regarding apple adapter, I came to this : "If you want to hook up some other sort of monitor (analog, DVI-I, ADC), this is not for you, or you may need an additional adaptor. ". I guess I´m in this situation but still don´t know what type of adapter or cable I should use...
Other possible solution : My TV has also HDMI port, I could try a DVI to HDMI cable but it´s quite difficult to find it here (south of spain...)
Does anyone have an idea with these new informations ?
Thanks in advance.

Does the iPad3 support external monitors, allowing you to scan across two screens?

Does the iPad3 support external monitors, allowing you to scan across two screens?

Some apps, such as Keynote, support different displays on the iPad screen and an external display. The iPad does not span it's "desktop" across screens, though; it only mirrors.
Regards.

Black border on DVD playback with external monitor...why?

Hi all,
I've got a late 2011 MBP 13". Very happy with it (although use is limited as a DJ laptop - and, since I moved abroad, as the basis for a home cinema) and was quite happy to watch films / TV on it as it came. However, I wanted to be able to watch with other people and so have invested in an external monitor.
I have bought a Philips 23" V-line (model number 236V3L). I am completely happy with the picture quality etc but just have an issue during DVD playback:
The image (on fullscreen mode) has a 2" black border all the way round. I've tried fiddling with settings etc but can't seem to lose it...and don't know why. I wouldn't mind but obviously my 23" image is significantly smaller as a result.
Can anyone tell me why? When using the laptop in any other way (i.e. whilst typing this post) there is a 3/4" border on the left and on the right (but not at the top). Is it something to do with the aspect ratio? Is there anything I can do to fix it?
Looking forward to hearing your thoughts...
Regards,
Fin

I use my laptop and a Samsung SyncMaster as my main screen and my MBP as the secondary. I can drag the DVD window to the laptop screen, and then put it in full screen mode. Here is where the problem lies: When I click any application on the primary monitor, the DVD screen shrinks back to normal size.
In DVD Player's "Full Screen" preference. enable "Remain in full screen when DVD PLayer is inactive".

Using the MacBook Pro with external Monitor and Keyboard

This may be a dumb question, but here it goes anyway:
Can I use the MacBook Pro with an external monitor and a bluetooth keyboard and mouse without having it opened all of the time ?
I am planning to buy a MacBook for my wife and most of the time she will be using it at her home office.
I don't want her to use the computer opened all of the time when she is actually looking at the separate screen and using a separate keyboard. Having the laptop opened will only accumulate dust and reduce the lifetime of the built in screen.
What I would actually need is a kind of "docking station", but Apple doesn't make that - I know.
So can the MacBook at least be operated without the internal screen powered on while it is closed?
Thanks for your help
Martin
Message was edited by: mdopp

Yes - it's called clamshell mode:
http://support.apple.com/kb/HT3131

Beyond 2560 x 1440 with External Monitors - is W540 the only Option?

Hello Everyone,
I went through great efforts to upgrade my x201 to a T430s (NVIDIA) in order to drive 3 external monitors from a dock which I finally got to work.
I do this because I like to travel between home and the office, but have equally elaborate set ups with external video and external audio, yet while being able to travel with the same laptop.
I am now experimenting with 2, not 3 monitors, using the new LG 34" curved monitors, which are a bit bigger and display at 3440 x 1440.
The good news is using my T430s I am able to get both monitors to display at 3440 x 1440 and they look great!
The bad news is that if I open up just one too many windows, or drag something across the extended desktop, they are crashing.
When they crash, I lose the signal (DisplayPort) and get error messages from the monitors.
I have already spoken to
1) Lenovo sales
2) Lenovo tech support
3) Lenovo tech support in Atlanta
and no one seems to have any idea what I am talking about.
I am guessing I may need to upgrade from my T430s, which I would rather not do.
I am also guessing that the W540 would have enough graphics / video horsepower to drive at least 2 of these higher resolution monitors?
In an ideal world, I would not have the extra weight or features of the W540, but first and foremost, I want multiple and dazzling high resolution displays from a dock.
Given that I am going from 3 screens down to 2, also wondering if say, an X1 Carbon might drive 2 using a dock?
Or it is only able to drive 2 screens at 1920 x 1080 or 2560 x 1440 best case.
In summary, any advice please:
1) W540 using LG "ultrawide" screens as described above
2) Any other Lenovo laptop not as big or heavy as the W540 which would still have high end, high powered graphics capabilities when docked?
Thank you and best regards,

Thank you for replies so far.
Re Lenovo tech "support" I am a die hard Lenovo fan (4 laptops so far...) but find Lenovo's website confusing and their tech support terrible.
For my T430s, I paid for at least an hour of support to no avail, before discovering that it was a simple Windows update that was the key to driving 3 external monitors, with better information generally coming from this forum. Supposedly, even the T430s with the NVIDIA upgrade can handle 3 external monitors at 2560 x 1440.
Now, however, I would like to use bigger and higher resolution screens, even if it means going from 3 external monitors to only 2.
I have used the T430s and dock, driving 2 of the new Samsung 28" 4K monitors up to 2560 x 1440 without any issues. But moving up to the LG 34 ultrawide screens with 3440 x 1440, I can only run one. With 2 it becomes unstable.
I hope more Lenovo fans tune into the resolution and display quality - it would only enhance the brand.
Even for business only users, with data and text, everything is cleaner, crisper and less fatiguing at the higher resolutions.
ColonelONeill thanks for suggestion but hoping to find an integrated, on board, plug and play, drop into the dock and be done with it solution.
So again, hoping that worst case, the W540 with the highest spec video card could drive 2 of the LG ultrawide monitors without struggling?
Or one of the other newer machines?

MacBook Air with external monitor and wired network

Hello,
I'm investigating the possibility to buy a MacBook Air 13", but I have a big doubt: most of the time I work in office, with wired LAN and an external DVI monitor.
I've seen that I can buy an USB to LAN adapter and a DisplayPort to DVI to connect to the Thunderbolt port, but in this case I will have only one USB port free a no other Thunderbolt.
Is anybody advising a different set of periferals to deal with this environment?
I haven't found any Thunderbolt "HUB" around, does this exist, to multiply the Thunderbolt port?
Thank in advance for any advice
Massimiliano

Naturally yes .. The problem is not the USB itsself, but the fact that original adapters from Apple (LAN and DVI) are made from a Thunderbolt connector, and they do not replicate the port where they are connected to.
Others party LAN adapters that comes on USB port are only 10/100 Mbs, whilst the Apple's one is a Gigabit. This is why I asked for some sort of Thnderbolt hub, or any other experinced advice..
I know that the MacBookAir comes with a good 802.11n integrated wireless, but as you know (or can imagine), when you are in the office a Gigabit connection is another movie, especially if you are tranferring large amount of data or are connected to huge centralized databases.
I was preferring a MacBook Air to the pro for it's monitor: for me a 1440x900 is much more better than a 1280x800 when I'm out of office. On the other hand, the version with the retina display is at the moment too expensive for my budget.
The final solution could be a MacBook pro 15", but I was preferring the 13" when in mobility, for its form-factor.

Problem with external monitor

Hello all,
did you ever use an external monitor with the mac book pro? Once disconnected the external monitor, the Mac freezes and becomes unresponsive. Do you know why?
thank you very much
Fulvio

I have the same problem with my external Acer monitor, starting today. Suddenly, when connected to my MacBook, the Acer monitor says "Input Not Supported". If the Acer monitor is not connected, it says, correctly, "signal not detected".
When the external monitor is connected, my MacBook can see it, has a display preference for it, lets me change resolution, etc, but the Acer monitor simply says "Input Not Supported". This just started today, and I did the system upgrade yesterday. Is there a connection?
I've tried the usual fiddling with connections, rebooting, everything.

Why the Slowdown with External Monitor?

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