External monitor causes earth loop problems

When i connect an external monitor to my macbook pro it creates horrible interference, soudns like an earth loop somewhere but i can't stop it.
Is very irritating!
Any suggestions would be much appreciated.
cheers,
josh

still has horrible interference. Think its not an earth problem now as the interence is more than a simple hum problem, it changes when i click mosue or open applications and can hear digital nastiness to it.
I spoke to a lecturer at uni who has the same problem he seems to thinks its a design fault with the core audio processors position i nthe mac. Its very near next to the circuits for the external monitor and it causes the intereference or soemthing like that when an external monitor is connected. Though mac are known to be good for msuci production for stablilty and software support the core audio is far too noisey even without external monitor plugged in so i feel the only way to resovle this is with an external soudncard. When used with my RME fireface the interference disappears but this card is for my PC as i don't wanna be taking out adn about with me for obvious reasons! Maybe a nice edirol FA-66 will be in my stocking at christmas...
cheers for the reply.

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External monitor causing playback problems?

Sorry if this has been covered before. I tried searching but it kind of comes down to what verbs people use to describe the problem.
I'm running FCP 5.1.4 on a Macbook Pro, and I just bought a Dell 2408 for an external monitor. A few times since I've hooked up the monitor, when I play in the timeline, the video skips and stutters and keeps looping back to the same section. If I switch to a different sequence, it plays fine. This only seems to happen when I have the cinema preview on. If I kill it, click on the canvas window and hit play, it usually plays fine.
So I've got some workarounds on this, but it's an annoying quirk. Has anyone else had this problem? It seems to be tied to the external monitor, but I don't know if I'm missing a step or something isn't setup quite right.
Any thoughts or help is greatly appreciated.

Go to your Audio / Video Settings >> A/V Devices tab and turn of "Mirror on desktop" for Playback ... this will reduce the load on your system as it will not be trying to decode the video for two separate (and different) playback streams simultaneously ie when using Digital Cinema Desktop Preview to display All Frames then you will not see playback in the Canvas window as well, just on the external preview monitor.
And/Or you could also try setting FCP's System Preferences >> Playback Control >> Gamma Correction to "Approximate" ... according to the manual this can offer a little performance boost (but to be honest I haven't ever tested this).
Choosing Real-Time Playback Gamma Correction Options
Whenever you watch your video on a computer display (such as video displayed in the Canvas, the Viewer, or via Digital Cinema Desktop Preview), Final Cut Pro applies gamma correction to the video to more closely approximate the way it would appear on a video monitor.
Note: Gamma correction is not applied to external video outputs such as DV or third-party interfaces because this correction is inherently applied by external video monitors.
If your computer’s graphics card supports gamma correction, Final Cut Pro automatically uses the card for accurate gamma correction. If your computer has an older graphics card that does not support gamma correction, you have two gamma correction options in the Playback Control tab of the System Settings window.
Accurate: High-quality gamma correction. This option is the most accurate but also requires the most processing power.
Approximate: Lower-quality gamma correction. This option leaves more processing power available for real-time effects but results in less accurate color and brightness rendition.
Tip: If your real-time performance is limited, try changing the gamma correction setting to Approximate (if available).
Hope it helps
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External Monitor causes MBP to turn off

I got my MBP back in April. I also got a Dell 2005FPW external monitor that I hook up to my MBP when I am at my desk. My MacBook Pro gets really, really hot, just like others and apparently that is ok. I guess it is no longer a "laptop" because it is too hot for a lap. Anyway, aside from being uncomfortable, the heat usually does not cause problems. However, I have found that when I plug in my external monitor and have both screens going and have my processors maxed with some video applications my MBP will just turn off. Not sleep, or anything else, it will simply turn off. This is while it is plugged into the power so it is not a battery problem. How can I get my MBP to stop turning off, aside from not plugging it into my external monitor and running intense applications?
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Jonathan

Do the random shutdowns happen when you don't have your MBP
connected to the external display?
I have tried to duplicate the random shutdowns without the monitor attached, but to my touch, it feels as though the MBP does not get nearly as hot as it does with the external display attached.
Do the shutdowns happen with less intensive processor
tasks?
No, it is usually when I have multiple programs open and both cpu's are near their peak.
Are you using the display cable that came with the Dell
display? Is the cable firmly seated in the display and the
MBP?
Yes, I am using the cable that came with the Dell display. Yes, firmly seated.
Have you installed any third party software that uses
kernel extensions (like a temperature monitoring program)?
No, but I have downloaded TechToolDeluxe, I have just not run it yet. Should I?
Do you hear the fans come on at any time before it shuts
down?
Not that I noticed but I was not really paying attention.
A little more background information. I originally found this problem because I would have my MBP at my desk at home, hooked up to the power supply, external keyboard/speakers/monitor. I would start a video processing application running on a long task and go to bed. I would come back and the MBP would be off. I would turn it back on and the task I had it working on would be only partially completed.
So I took it to work where I sit in an air conditioned office and have it on a glass-top desk. I tried to hammer it with tons of programs being open and video processing applications. The CPU's would run on max for hours and the MBP would get plenty hot but would not shut donw.
It is only recently that I realized that the shutdowns happened only when connected to the external monitor. So I thought that perhaps the video card for the external port was producing just enough extra heat to get the MBP to shut down. To test this I ran the same video processing application that I usually run over night, only this time I left the external monitor detached. No shut down.
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NEW09 imac External Monitor causes mouse to freeze every 4 sec for half sec

Would love some help
Every time I connect my external monitor my mouse will stick every 4 sec for less than a half sec (not exact but it it's doing it in a repeating pattern).. If I unplug it it stops and when I plug it back in in starts again.
4 day old imac 10.5.7 fully updated 2009 CTO Ati 4850 4gigs ram 1tb storage.
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Did you do the usual general trouble-shooting?
Run Disk Utility and use the +Repair Disk Permissions+ on the startup volume.
When you restart, use the reset PRAM procedure.
http://support.apple.com/kb/HT1379
If that does not help, try creating a new admin user account in System Preferences Accounts pane
http://docs.info.apple.com/article.html?path=Mac/10.5/en/8235.html
Log out and log in to the new account. Does this same problem occur in the new account? If not, you have narrowed down the cause to something in your normal account. It could be some corrupted user preference setting, or some background process (perhaps something third party) that runs when you are logged into your normal account.
If it does occur in the new account too, restart using the Mac OS X installation disc. Insert the disc and restart with the C key held down to force a restart from the optical drive. When it gets to the Installer's first screen, don't go any further, but note if this problem still occurs (when you are booted from a different system).

X240 (Win 8.1) w/ Ultra Dock and two external monitors connected via DisplayPort problem

I'm having trouble making this combination work. This Ultra Dock does have two DP connectors, computer sees both external monitors (HP ZR24w) but I cannot get any picture on both at the same time using DP. Sometimes one display does work, but that is not always working.
When I connect same monitors via VGA/DSUB and DP (with Lenovo DPtoDVI converter) I can get this to work - both same time - , but I'd prefer them both digital and both native DP as both monitors do have that port.
Ultra Dock does already have the latest firmware and this problem seems to not relate to the flickering problem with T440 etc. X240 is also running latest UEFI/BIOS and I've also tried latest Intel Beta display driver, no effect.

shelmers wrote:
W520 with Win 7 Pro
Minidock Plus Series 3
Two Asus monitors attached via DVI
Let me start by saying that the internal and both external monitors work simultaneously. However, getting to that state is the problem.
I can boot successfully with the laptop in the dock with 1) just the internal monitor, or 2) the internal and one external monitor connected.
However, if I try to boot with both monitors connected via DVI, the following happens:
Windows logon screen appears -- but there is no cursor on the screen
I enter the password and the login continues for 30-60 seconds, then
Blue screen SYSTEM_SERVICE_EXCEPTION for nvlddmkm.sys with STOP x0000003B
Lenovo has replaced the dock with no change in behavior.
Drivers and BIOS are current.
Most recent change was to set BIOS so Win 7 automatically detects Nvidia Optimus.
At this point, my best workaround is to disconnect one external monitor whenever I need to reboot, and then connect it again after everything is runing. Not terrible... but it really shouldn't be necessary. Any suggestions?
If you want to drive the monitors in the manner stated, the BIOS Display property must be set to Discrete and the auto detection below it must be disabled.

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When I plug my macbook pro retina (Lion) into a 24" monitor through the DVI adaptor, the cursor jumps erratically every ~10 seconds when being moved. Feels like a lag and is worse with more programs running. Does not depend on mouse or mouse surface. Trackpad does it too. Any ideas? Thanks in advance.

Hi AO1 James,
If I understand correctly, the external monitor was blurry from the moment you plugged it into your MacBook Pro with Retina display. I would first check the resolution settings for the monitor with the "How do I select additional resolutions on my display?" section of the following article:
Apple computers: Troubleshooting issues with video on internal or external displays
If it remains blurry after selecting your monitors optimal resolution, I would use the steps under the "Reset the system" section of the article to help troubleshoot the issue.
Thank you for using Apple Support Communities.
All the best,
Sterling

IMac 27" & External monitor ( Benq 241 ) resolution problems

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You can get one like this
http://store.apple.com/us/product/H1824ZM/A/Moshi_Mini_DisplayPort_to_HDMI_Adapt er?fnode=MTY1NDA3Ng
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External monitor causes FCP to flicker

I want to connect my MacBook Pro to an external monitor, mirroring the laptop, and run FCP 6 there. When I do so, the displayed FCP windows flicker severely when played, as if the computer is remembering the first frame FCP was at when the monitor was connected, and the playback flickers between that frame and the current frame. There is no flicker when Play is stopped, and the display does show the correct frame. Re-starting Play, the playback again flickers between that same original frame and the current frame.
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Not in this case, I just tried to mirror my displays on my Mac Pro and it did exactly the same thing as yours and I had to quit FCP to get it back to normal, strange, but why do you want to mirror your displays when you have the better option to edit with two screens?.
DM

3 external monitors + built in LCD Problem

Hi Everyone first the setup:
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Is there a way to get the Built in LCD to be active with the other three monitors?
All graphics drivers are up to date. Bios is updated and the Docking port Firmware is up to date.
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dont think its possible:
I asked at bottom here....
http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/Three-external-monitors-own-LCD-in-W540-with-n...
I found this myself in the W540 manual: "For the ThinkPad Ultra Dock, if you connect two displays to the DisplayPort connector and the DVI
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For the ThinkPad Ultra Dock, if you connect two displays to the DisplayPort connector and the HDMI
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Could external monitor cause kernal panic?

Hi there, I'm trying to track down the cause of a couple of nasty kernal panics that have caused me to have to zero my hard disk and re-install twice in the last couple of weeks.
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I use a cheap and cheerful LCD monitor for a split screen Logic Pro setup. I noticed that the grey screen with the apple logo distorts while OSX is booting when the extra monitor is plugged in...... It's made me wonder if that is the source of my troubles, could that be the case?

Hardware or software can cause the kernel panic. You don't have to waste time and zero out your drive. Just isolate the cause whether it be software or hardware then deal with it.
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External monitor initially flashes on waking from sleep

I recently upgraded to 10.4.8. My PowerBook is connected to an external monitor and now often flashes when I wake the machine from sleep. It takes a while too settle down but then works fine. If I wake from sleep without the external monitor, there are no problems. I had no problems using 10.1. Does anyone have a fix?
G4 PowerBook (PowerBook6,1) Mac OS X (10.4.8) 867 MHz

I found the following article from Apple: TA20612. It reads as follows:
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Macbook pro does not support Final Cut Pro preview on external monitor?

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I have been reading around some forums, and have seen a couple of people with the same problem.
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You have probably already done it but ensure you have updated the OS and Quicktime prior to attempting to instal Final Cut Studio.
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17" crash when using external monitor.

Since I bought this powerbook back in mid January I have been having problems with the computer crashing whenever it is connected to an external monitor. Usually the problem happens in either safari or terminal and ALWAYS happens when I use my scroll mouse.
According to my system.log this is the error I receive once the computer crashes:
Feb 9 18:09:34 Aluminum kernel[0]: ATIRadeon9700::waitfor_rbspace: Overflowed block waiting for FIFO space. Have 2, need 8. RBBM_STATUS 0x8401c100
According to google this problem has been occurring since Panther.
http://www.google.com/search?client=safari&rls=en&q=waitfor_rbspace&ie=UTF-8&oe=UTF-8
I have done all the defacto mac troubleshooting (pram, permissions, sudo rm -rf /mach
So far my problem has still remained unresolved. I am wondering if anyone else is having this problem. If so what monitor are you using? Does this happen regardless of having an external monitor attached? Do any ADC members know if 10.4.5 is going to have any ATI updates? Please help.

Since I bought this powerbook back in mid January I have been having problems with the computer crashing whenever it is connected to an external monitor. Usually the problem happens in either safari or terminal and ALWAYS happens when I use my scroll mouse.
According to my system.log this is the error I receive once the computer crashes:
Feb 9 18:09:34 Aluminum kernel[0]: ATIRadeon9700::waitfor_rbspace: Overflowed block waiting for FIFO space. Have 2, need 8. RBBM_STATUS 0x8401c100
According to google this problem has been occurring since Panther.
http://www.google.com/search?client=safari&rls=en&q=waitfor_rbspace&ie=UTF-8&oe=UTF-8
I have done all the defacto mac troubleshooting (pram, permissions, sudo rm -rf /mach
So far my problem has still remained unresolved. I am wondering if anyone else is having this problem. If so what monitor are you using? Does this happen regardless of having an external monitor attached? Do any ADC members know if 10.4.5 is going to have any ATI updates? Please help.

Disconnecting external monitor in sleep causes MacBook wake problem

Hi,
With previous laptops I would put it to sleep and then disconnect the cables for my external monitor and put it in my bag.
However, with my MacBook, after it goes to sleep and when I disconnect the cable for my external monitor it wakes up, except that it doesn't fully wake up. When I open the lid the screen is blank/black, and no amount of closing and opening the lid, pressing keys on the keyboard, clicking my mouse will wake it up. I end up having to force the computer to switch off--which I hate doing.
(In addition, I get that snow problem at random times, which has been mentioned elsewhere on this forum. Also, my previous generation MacBook had that issue with the screen going blank/black randomly for half a second.)
This is really annoying. I'm not impressed at all. It seems that Apple's quality is going downhill. I'm quite disappointed really.

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After upgrading to 8.1 the other day, I began getting very noticeable window and mouse lag on the external monitor. Dragging windows would jump around, aero peek renders were slow, and the 'ribbon' screen saver would pixelate and was slow to wake up.
I installed the updated DisplayLink drivers, and also all the updated Lenovo drivers, but the problem remained. This morning I was trying different ideas and found something very interesting:
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So, it seems to be some kind of interaction between the automatic disabling of the Yoga's keyboard/touchpad and any external mouse. Has anyone else seen anything similar? Any ideas on how to solve so I can use the Yoga in the stand configuration?

Just to close the loop on this, I've determined that the cause of my issue is the Intel Dynamic Platform and Thermal Framework software/driver. I've disabled in the BIOS for now, and the machine is working very well. Will look for an update from Lenovo to address more definitively.

External monitor causes earth loop problems

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