MBP + external monitor + USB mouse + iTunes = lag

Hello, I am wondering if any of you can offer a solution to my problem. When I use my mac with my external monitor and external mouse, there is a systemwide lag every 3 seconds - the display sort of pauses, briefly interrupting mouse input and video playback. When deleting a long line of text it is again apparent.
It is not the mouse, as I have tried 3 different mice with the up to date drivers and they all work fine while itunes is not open and when using the laptop's screen, which also eliminates the variable of a poor mouse surface (it is good regardless).
There is no skipping when using the laptop's screen, regardless of itunes being open or not. Also, there is no skipping at all when I boot into windows and use it with the external display.
The skipping also occurs when video is being played back via Quicktime, with iTunes closed. The same video played with VLC does not cause the issue.
I have the computer hooked up to a Samsung SyncMaster 2494HM LCD, via the apple mini DP to DVI adapter, and with a DVI-HDMI cable (this decreased the issue from when it was connected with DVI and skipped all the time).
I have tried a different user account, and the problem persists there too. I have reset my PRAM and NVRAM also.
This is quite strange; any suggestions?

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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).

External monitor USB connected NOT HDMI - xperia neo

Could anybody share details of external monitor tried with usb with xperia neo?
I have seen some monitors like AOS e1649Fwu which can connect with USB.
I don't have any HDMI ported monitor.
Also I want to use USB OTG capability to connect external devices. I was able to access mouse and keyboard.
If anybody able to access other devices like pen drive etc.. please share the steps how you have achieved with xperia neo.
All these queries are for "xperia neo" only"

As I understand this requires root access.
I will therefore move this tread to the correct forum.
- Community Manager Sony Xperia Support Forum
If you're new to our forums make sure that you have read our Discussion guidelines.
If you want to get in touch with the local support team for your country please visit our contact page.

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If I just boot at the dock with only the monitor plugged in, I loose the mouse/keyboard on the laptop. Using the VGA plug.
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I've tried 3 different mice and keyboards. The issue presents even if I just plug the monitor into the laptop without the dock either vga or div-x. The dock is a series 3 mini.

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Two things, i can hold down power button till hard stop, then press again to restart, and all is fine; no error messages when win 7 start up again. Or i have once just left it sitting without holding power button- it seemed to be like this for about 4 hours (monitor went to standby cause idle) before powers down.. When i start laptop after this i get windows warning failed to shut down properly.
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Replug DeII usb hub back to laptop; no problem laptop back to normal shut down.
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To be honest I dont know why the system cannot shut down properly without connected USB monitor hub but system shut down issues are mostly related to some processes which are running in the background.
Sometimes such processes are locked and could not be closed due to different reasons. This may prevent the system from shut down
Maybe this is the case
Try to clean the system as well as the registry using CCleaner (its freeware tool).
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Just got my 24" Samsung Sync master set up with apple keyboard & usb mouse. Just wondering if it's possible to use a usb connection somehow with the monitor - my dream set up is plug one usb hub with everything connected to it, to the mac book pro, & be sailing. I know it's a little thing, but it is a faff to have to plug two different things in - & remember to take the adaptor when out & about so I can use a projector.
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(maybe I should just live with the faff!)
Yes.

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You can edit posts for ~15 minutes after they are first submitted, using the edit button () above and to the right side of your post. Also, you may want to add your new machine to your signature (click on My Settings at the right of the page).
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Thanks for the feedback and sharing the comments from Apple. That kind of information helps other users!
Some other things you can try.
Uninstall the LCC using the original installer.
Then do a manual search of the Library files and delete plist files showing Logitech or LCC in the file name. (Find and Spotlight do not search the libraries by default so you'll need to navigate to the User and System libraries manually before doing the search.)
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The one sure way to get rid of the LCC drivers is to do an Erase and Install of the OS - It is a lot of work....
Short of a full Erase and Install, after manually removing the LCC drivers and plists, you can download and run the 10.5.5 Combo updater which may (or may not) correct faulty driver issues.
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Hi Lawrence
Please see these threads
http://www.flickr.com/groups/aperture_users/discuss/72157603938494562/#comment72 157603938917512
http://discussions.apple.com/thread.jspa?messageID=6607576&#6607576
http://forums.dpreview.com/forums/readflat.asp?forum=1017&thread=26790902
The Aperture Engineers are aware of this problem.
Mike

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I have a macbook pro 13'' (2011) and OS X Lion. But the mac crashes every time I try to boot while I use an external monitor.
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I have the same problem. I have MBP 13" and it used to able to hooked up to 23" PHillips Monitor via displayport to VGI. But after installing Lion and after everything connected, my external monitor does not work everytime I close my MBP. Before with S leopard, when I close my MBP and wake the comp using bluetooth keyboard (apple), i was able to wake the MBP and the external monitor displays. But now (Lion) when I close MBP, external monitor shows this error message "Cannot display this video mode, change computer display input to 1280 x 760 @ 60 Hz". Then I opened MBP and I changed the display to 1280 x 760 but when I close MBP, the external monitor shows the same error message.
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Yes, it's possible to run an external monitor — all MBPs can do that. You can use any monitor and almost any widely available USB or Bluetooth mouse or trackpad, though I highly recommend Apple's own Magic Trackpad.

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Goobey - you have your monitor set up in extended mode. This gives you the effect of having an extended desktop. You can drag applications to the monitor and have multiple apps on screen at once.
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MBP + external monitor + USB mouse + iTunes = lag

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