External display at 1920x1200 causing audio dropouts

I've got my Macbook hooked up to a Samsung Syncmaster 245B+ 24" monitor running at 1920x1200 with the Macbook in clamshell mode, I bought the monitor a couple of weeks ago and ever since I've been having problems with audio dropouts, both with the onboard soundcard and my external Presonus Firefox Firewire audio interface.
It seems the CPU is being overloaded at random, usually when there is some kind of graphical happening in a web browser for example. If I load up a page with a lot of graphical elements on it, sometimes the audio cuts out for a few seconds and then comes back, even then it can come back distorted. I can usually force these dropouts by briskly resizing the browser window, which makes the CPU usage level increase somewhat and thus the audio cuts out.
I first of all put this down to the Macbook not being able to display at this resolution sufficiently, but I have seen no other complaints from people running a 24" external. What's even more concerning is that I can switch the external down to lower resolutions (ie 1024x640) and still get the audio dropouts, which should not be happening as the Macbooks own display runs higher than this and I never get a problem when using it that way.
I've tried creating a new user account and the problem persists. Tried repairing disk permissions (although I knew it would make no difference) to no avail. I suppose the next step would be a complete reinstall of Leopard, but obviously would like to avoid this.
Does anyone have any suggestions as to what the problem could be? Do you think it's just the Macbook in general not being able to handle this monitor or a specific problem with mine?
I hope I can get this sorted, it's really off putting having music dropouts while I am working...
TIA,
Alex

Next time is happens, try unplugging the external monitor, but only the external monitor. Leave everything else plugged in, including any peripherals, like the Personus and also any attached USB devices. If the problem persists, then start unplugging the peripherals one-by-one.
Generally a display should have no bearing on sound since the GPU (X3100) is completely separate from the CPU where sound is managed.
You haven't said anything about your MacBook's configuration but maybe there is an insufficient amount of RAM for the number of processes running. That's another possibility.

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Hardware Overview:
Model Name:          iMac
Model Identifier:          iMac7,1
Processor Name:          Intel Core 2 Duo
Processor Speed:          2.4 GHz
Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache:          4 MB
Memory:          2 GB
Bus Speed:          800 MHz
Boot ROM Version:          IM71.007A.B03
SMC Version (system):          1.20f4
Hardware UUID:          00000000-0000-1000-8000-001B63B25192
Kernel Panic Log:
Interval Since Last Panic Report: 706 sec
Panics Since Last Report:          2
Anonymous UUID:                    87195EA1-746B-4068-808E-A8277AFA6070
Sun Mar 4 23:52:33 2012
panic(cpu 0 caller 0x001AB0FE): Kernel trap at 0x00d4545d, type 14=page fault, registers:
CR0: 0x8001003b, CR2: 0x00000000, CR3: 0x0119b000, CR4: 0x00000660
EAX: 0x00000000, EBX: 0x00000036, ECX: 0x044b0d94, EDX: 0x0001a5e0
CR2: 0x00000000, EBP: 0x00108b18, ESI: 0x04794440, EDI: 0x00108ff0
EFL: 0x00010006, EIP: 0x00d4545d, CS: 0x00000008, DS: 0x00520010
Error code: 0x00000000
Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x108918 : 0x12b4c6 (0x45f91c 0x10894c 0x13355c 0x0)
0x108968 : 0x1ab0fe (0x469a98 0xd4545d 0xe 0x469248)
0x108a48 : 0x1a1713 (0x108a60 0x108ab4 0x108b18 0xd4545d)
0x108a58 : 0xd4545d (0xe 0x286f0048 0x10 0x10)
0x108b18 : 0xd45fa4 (0x0 0x2f 0x12 0x0)
0x108b58 : 0xd46109 (0x0 0x0 0x0 0x528ce8)
0x108cb8 : 0xd46267 (0x1 0x4 0xd50d7c 0x0)
0x108cf8 : 0xd46085 (0x4 0xd50d7c 0x0 0x0)
0x108d38 : 0xd3a71f (0xd523e8 0xd52ebc 0x0 0x0)
0x108d98 : 0xd33912 (0x43cb410 0x108e58 0x1 0x1)
0x108dd8 : 0xd35ec8 (0x43cb410 0xd5843c 0x108e58 0x40)
0x108e08 : 0xd35efd (0x43cb410 0x8 0x108e58 0x0)
0x108e38 : 0xd32b1b (0x43cb410 0x8 0x108e58 0x49f78b8)
0x108ea8 : 0xd41d66 (0x43cb410 0xd568b4 0x10c60 0x6)
0x108ed8 : 0xd1a2b3 (0x4bb5954 0x3de13c50 0xd 0xd568b4)
0x108f08 : 0x6aacbd (0x4794440 0x36 0x23eff000 0x0)
          Backtrace continues...
      Kernel loadable modules in backtrace (with dependencies):
         com.apple.kext.ATY_Hypoprion(5.4.8)@0xce5000->0xd5ffff
            dependency: com.apple.iokit.IONDRVSupport(1.7.3)@0x6a0000
            dependency: com.apple.iokit.IOPCIFamily(2.6)@0x5ce000
            dependency: com.apple.iokit.IOGraphicsFamily(1.7.3)@0x683000
            dependency: com.apple.iokit.IOACPIFamily(1.2.0)@0x627000
         com.apple.iokit.IONDRVSupport(1.7.3)@0x6a0000->0x6adfff
            dependency: com.apple.iokit.IOPCIFamily(2.6)@0x5ce000
            dependency: com.apple.iokit.IOGraphicsFamily(1.7.3)@0x683000
BSD process name corresponding to current thread: WindowServer
Mac OS version:
9L31a
Kernel version:
Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386
System model name: iMac7,1 (Mac-F4238CC8)
System uptime in nanoseconds: 1421066020480
unloaded kexts:
com.apple.driver.InternalModemSupport          2.4.0 - last unloaded 125555815961
loaded kexts:
com.apple.driver.InternalModemSupport          2.4.0 - last loaded 18399940146
com.apple.driver.AppleHDAPlatformDriver          1.7.1a2
com.apple.iokit.IOBluetoothSerialManager          2.1.8f2
com.apple.filesystems.autofs          2.0.2
com.apple.driver.AppleUpstreamUserClient          2.7.5
com.apple.driver.AppleHDAHardwareConfigDriver          1.7.1a2
com.apple.driver.AppleHDA          1.7.1a2
com.apple.kext.ATY_Hypoprion          5.4.8
com.apple.driver.AppleHWSensor          1.9d0
com.apple.Dont_Steal_Mac_OS_X          6.0.3
com.apple.driver.AppleGraphicsControl          2.8.15
com.apple.driver.AppleTyMCEDriver          1.0.0d28
com.apple.driver.AppleHDAController          1.7.1a2
com.apple.iokit.IOFireWireIP          1.7.7
com.apple.driver.AudioIPCDriver          1.0.6
com.apple.ATIRadeonX2000          5.4.8
com.apple.driver.AppleIRController          113
com.apple.driver.ACPI_SMC_PlatformPlugin          3.4.0a17
com.apple.driver.AppleLPC          1.3.1
com.apple.driver.AppleBacklight          1.6.0
com.apple.driver.CSRUSBBluetoothHCIController          2.1.8f2
com.apple.driver.AppleUSBHIDMouse          1.2.4b3
com.apple.driver.AppleHIDKeyboard          1.0.9b4
com.apple.driver.CSRHIDTransitionDriver          2.1.8f2
com.apple.driver.iTunesPhoneDriver          1.0
com.apple.iokit.IOUSBMassStorageClass          2.0.8
com.apple.driver.AppleUSBMergeNub          3.4.6
com.apple.driver.PioneerSuperDrive          2.0.9
com.apple.iokit.SCSITaskUserClient          2.1.1
com.apple.driver.XsanFilter          2.7.91
com.apple.driver.AirPortBrcm43xx          366.91.21
com.apple.driver.AppleFileSystemDriver          1.1.0
com.apple.iokit.IOAHCIBlockStorage          1.2.2
com.apple.iokit.IOATAPIProtocolTransport          1.5.3
com.apple.driver.AppleFWOHCI          3.9.7
com.apple.driver.AppleUSBHub          3.4.9
com.apple.iokit.IOUSBUserClient          3.4.9
com.apple.driver.AppleAHCIPort          1.7.0
com.apple.driver.AppleIntelPIIXATA          2.0.1
com.apple.driver.AppleUSBEHCI          3.4.6
com.apple.driver.AppleUSBUHCI          3.3.5
com.apple.iokit.AppleYukon2          3.1.13b2
com.apple.driver.AppleEFINVRAM          1.2.0
com.apple.driver.AppleRTC          1.2.3
com.apple.driver.AppleHPET          1.4
com.apple.driver.AppleACPIPCI          1.2.5
com.apple.driver.AppleACPIButtons          1.2.5
com.apple.driver.AppleSMBIOS          1.4
com.apple.driver.AppleACPIEC          1.2.5
com.apple.driver.AppleAPIC          1.4
com.apple.security.seatbelt          107.12
com.apple.nke.applicationfirewall          1.6.77
com.apple.security.TMSafetyNet          3
com.apple.driver.AppleIntelCPUPowerManagement          76.2.0
com.apple.driver.DiskImages          199
com.apple.BootCache          30.4
com.apple.iokit.IOSerialFamily          9.4
com.apple.driver.DspFuncLib          1.7.1a2
com.apple.iokit.IOHDAFamily          1.7.1a2
com.apple.iokit.IOAudioFamily          1.6.9fc5
com.apple.kext.OSvKernDSPLib          1.1
com.apple.driver.IOPlatformPluginFamily          3.4.0a17
com.apple.driver.AppleSMC          2.3.1d1
com.apple.iokit.IONDRVSupport          1.7.3
com.apple.iokit.IOGraphicsFamily          1.7.3
com.apple.driver.AppleUSBBluetoothHCIController          2.1.8f2
com.apple.iokit.IOBluetoothFamily          2.1.8f2
com.apple.driver.AppleHIDMouse          1.2.4b3
com.apple.iokit.IOUSBHIDDriver          3.4.6
com.apple.driver.AppleUSBComposite          3.2.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice          2.1.1
com.apple.iokit.IOSCSIBlockCommandsDevice          2.1.1
com.apple.iokit.IOBDStorageFamily          1.5
com.apple.iokit.IODVDStorageFamily          1.5
com.apple.iokit.IOCDStorageFamily          1.5
com.apple.iokit.IO80211Family          216.1
com.apple.iokit.IOSCSIArchitectureModelFamily          2.1.1
com.apple.iokit.IOFireWireFamily          3.4.9
com.apple.iokit.IOAHCIFamily          1.5.0
com.apple.iokit.IOATAFamily          2.0.1
com.apple.iokit.IOUSBFamily          3.4.9
com.apple.iokit.IONetworkingFamily          1.6.1
com.apple.driver.AppleEFIRuntime          1.2.0
com.apple.iokit.IOSMBusFamily          1.1
com.apple.iokit.IOStorageFamily          1.5.6
com.apple.iokit.IOHIDFamily          1.5.5
com.apple.driver.AppleACPIPlatform          1.2.5
com.apple.iokit.IOACPIFamily          1.2.0
com.apple.iokit.IOPCIFamily          2.6

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Ok, here is what I have :
- MacBook Pro 13" early 2011
- Mac OS X Lion 10.7.3
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Here is my problem :
When I'm using my computer normally with AC charger plugged in everything is normal, once I plugin the external monitor, a process called LoginWindow takes up to 70% of my cpu and the cooling fan goes noisy.. If I unplug the AC power, everything is back to normal, and the external monitor keeps working normally, AC back -> 70% cpu is back, if unplug the monitor, everything goes back to normal again, In conclusion, external monitor and AC power doesn't work together...
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I'm having a similar problem.
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I'm starting to think that it maybe has something to do with Core Image/Quartz Extreme because it only seems to occur in Apple apps (Finder, Mail, Safari, etc).
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After much effort trying to fix the problem, I eventually called Apple support, which ultimately recommended that I reinstall OS X. I didn't do that, and continued to work at the problem. I eventually was able to bring it back by going into my Time Machine backups and restoring all the Display preference files (I used old preferences from back when I got the external HD, so I knew they'd be "uncorrupted). However, now I'm having problems with my external display, namely that it is not working.
This problem started early this year, so it might have been caused by the 10.5.5 update, but since I had all these other problems going on, I'm not sure if that was the case.
Problem:
The Macbook doesn't seem to recognize the display, or is having problems routing video to the display, or something.
If I plug the display into the Macbook while it is running normally, the Macbook LCD will flash blue (like it picked up a new display), but them come back to normal. The monitor will go out of sleep mode for a second, but then display a "No signal" message. If I attempt to "Detect Displays" the Macbook screen will either flash blue (as before) or just do nothing.
If I have the display plugged in when I start up the Macbook, everything will proceed as normal until the time the desktop would be displayed. Instead of this, I just see a blue screen (like some generic desktop before any background is applied). The menu bar, the dock, and icons do not show up. However, I can hear various audio cues telling me the computer is running fine except for htis problem (email notifier going off, etc.).
I know the problem is not faulty hardware, because when I boot my Macbook into Windows, everything works perfectly. It therefore follows that it is an OS X problem. I downloaded both Cocktail and Applejack and run various repairs on them (most notable repairing preferences), but nothing has changed.
Any suggestions about how to try fixing this? If there's any technical detail I've missed, let me know.
Thank you in advance to everyone who tries to help.
-Richard

I have same problem. MacBook Pro (new, 2014) upgraded to Yosemite. Had been running with ViewPoint high-resolution, 27" monitor, HDMI. I tried Thunderbolt connection -- it connected, but it would not allow the external monitor to run at its native resolution (2560x1440). It would only display properly using HDMI. Just 3 days ago after I installed the latest OSx software update, and my external monitor problems started. On startup, my MacBook screen flickers non-stop. I can fix problem eventually (after several tries) by disconnecting the HDMI cable, turning OFF the external monitor power, turning external monitor back ON and then plugging in the HDMI to my MacBook Pro. This is very inconvenient.
I will try using the Thunderbolt cable. When I tried it in the past, it connected, but it wouldn't display the native resolution of my external monitor (which is 2560x1440). Can only get this resolution now with HDMI.

External display at 1920x1200 causing audio dropouts

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