IMac, external monitor flicker/blink blue

I have an external monitor hooked up to my iMac and I have had no problems until today. It's the mini-DVI to VGA style connector.
During the day, I jarred my desk with my knee. The iMac and external monitor both blinked about four times, becoming blue like in the startup process. The view on the external monitor also went fuzzy for a second. No CPU functions appear to have been affected.
I shut down, checked all the cable connections, and restarted. The problem seemed to be resolved - until later when I was using the computer, and the same thing happened twice in about two minutes. This time the desk hadn't moved at all. Again, no CPU functions appear to have been affected.
In the Console, I see these messages at the time of the events:
<Error>: kCGErrorIllegalArgument: CGSGetDisplayBounds (display 3e41b5b9)
kCGErrorIllegalArgument: CGSGetCurrentDisplayMode
kernel
EDID does not contain Extended EDID, not valid for audio
A search seems to indicate that it may be cable-related, which is the best-case scenario, and I'm hoping it's not the graphics card or logic board.
Can anything be done to stop this from reoccurring?

Now it appears the problem has gotten worse. Much worse.
I've had the external monitor disconnected for five days now. I tried to plug it back in and the computer did not recognize it AT ALL. Nothing showed up on the display.
In addition, or however, the mouse movement on the iMac itself became very, very unresponsive.
Once I disconnected the monitor, everything on the iMac was functioning normally.
Have I messed something up inside the iMac?

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IMac external monitor not working after lion upgrade

Hi,
I have had an external monitor hooked up to my 09' imac for over a year now. I upgraded to Lion and ever since then it hasnt worked but one other random time when I moved and hooked everything back up. Im very tech savy, but this just doesnt make sense. Have combed google to find a solution. I have a Samsung 22in moniter and all the blue power button does is blinks at me. I am using a miniDisplay to DVI connection.
Does anyone have any suggestions other than resetting the ram?

I guess it's possible you've got some kind of hardware problem.... but not likley given it started with you installed your OS.
Here's a few things to try:
1. see if you can borrow another monitor just to be sure your monitor isn't the problem.
2. in System Prefs, and the Displays pane, click on the Detect Displays, then then the Gather Displays. If you get two diffenet display panes, that would lead me to think it's a monitor problem.
3. Lastly, disconnect your 2nd display, and restart. Then Shutdown, reconnect it, and see if that helps.
and of course..
4. make sure that all of your connections and adaptors are tight.

External Monitor Has A Blue Tint

I've had my iMac for about 4 years and I just hooked up an external monitor.
I bought the monitor a good while ago and it has been basically sitting in a closet for a few years.
Just bought a Mini-DVI to VGA adapter and when I hook the monitor up, there's a blue tint which I am assuming because the red is not coming through.
When I adjust the color settings, there is no difference in color from when the red is set at 0 and when it is set at 100.
At first I thought it might be the monitor because it's old and has been passed around to a few people but then I noticed the menu for the monitor is showing red hues just fine.
To test this out, I hooked my netbook up to the monitor and the picture looks just fine.
Any ideas?

Do you get this after switching users? This is something that intermittently happens to me on my MacBook after switching users. Restarting is the only thing I have found which fixes that issue however, so I don't know if it's related.
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External Monitor flicker... HELP !!!

iMac9,1 with mini DisplayPort to VGA external LG-W2242 in extended screen model.
Used to work well; recently flicker at 1680x1050.
This problem happens only at 1680x1050, and it is now at 1440x900 and is working.
But, the resolution is not the monitor optimum resolution at 1680x1050.
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Grey unselectable at 56 or 75Hz, how to activate this selection?
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Finally, I did more research and confirm that the problem is not related to Hardware.
It does not matter if you have Apple Mini DisplayPort to DVI Adapter or VGA Adapter.
I had in other thread, and understand that SwitchResX can solved this problem.
https://discussions.apple.com/thread/2387462
It has to be a OS problem, I tried it today with SwitchResX; and confirm that it can work with 1680x1050.
https://discussions.apple.com/thread/2650682?start=30&tstart=0
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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.
I tested all of my peripherals on 3 other mac's including new 8 core and mini and it works just fine (even when I connect the DELL monitor.
Also, tried to do a mirror instead of extended desktop and the problem persists
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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 flicker with ibook G3

I plugged in an external monitor into my iBook G3. At the highest resolution it flickers/ shakes. Is there anything I can do to resolve this?
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Is the monitor set at the same resolution as the iBook?

IMac external monitor video connector, huh?

Apparently, there are at least FOUR different types of video connectors in use these days.
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Mini-DVI to VGA to connect to a computer monitor with a 15-pin VGA connector (also on some modern TVs).
Mini DVI to Video to connect to a television using composite video (RCA jack) or s-video (mini-DIN).
Mini DVI to DVI to connect to a monitor having a DVI connector.

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OK, newbie to this forum, hi all!? I searched knowledge base and this forum, couldn't find this problem. If there's a discussion that I missed, my apologies, please point me to it.
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IMac CRT monitor has "the blues" -literally-how to repair? Or should I?

This week I tried to upgrade my 6 yr old iMac (purchased Jan 2000,350mhz & 64 MB, slot loading CD drive). My nephew helped me to put in a memory card (it's now 192 MB) and we successfully installed OS 10.2. My goal was to upgrade so that I could use DSL and network with my new Powerbook G4. After restarting once and verifying that OS 10.2 was working properly, we shut the iMac down and set to work connecting the DSL modem, and setting up the wireless connection on the Powerbook. All went well until I powered up the iMac; I got no chime with a completely black screen. I shut the power down, restarted and got a chime and a screen with only dark blue & black as the colors. OS 10.2 seems to be working just fine, and I successfully connected to the DSL network through the Ethernet port, and even set up the email account with the server! I can surf the web, but only in blue & black! I tried resetting the monitor on the control panels, but can only reset brightness, all colors appear as dark blue!! In the course of the evening we also once had only red & black and once only yellow & black. But now it has settled in to all dark blue & black on screen. I called a local Apple technician, and he said that it was most likely the video card on the logic board, and that it would cost about $300-400 to repair it. Also that the monitor problem was most likely in no way connected to the memory & OS upgrade (which seems correct as OS 10.2 is still working and we can use the DSL connection). I am really wondering if it is worth it to repair this iMac, considering its age and speed. Any suggestions greatly appreciated!

Sure :
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IMac External Monitor stopped working

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>reply below
If you are talking about a different message, saying see "below" or "above" will have zero meaning just as soon as someone posts another message
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I've MacBook Pro 15'' (late 2011) and I've attached an external monitor Samsung SyncMaster 2494HM using Mini DisplayPort to HDMI Adapter cable.
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I am experiencing flickering with my early 2008 iMac when driving an external monitor. My Thinkpad is flawless when pushing out to the monitor.
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Welcome to the forum!
Your GPU is failing.
Lenovo might or might not fix it, although it's out of warranty. They are *extremely* well-aware of the problem that plagued these chips.
Reading related threads here or on Bill Morrow's ThinkPad Forum will reveals hundreds - if not thousands - of similar cases...
Good luck.
Cheers,
George
In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

IMac, external monitor flicker/blink blue

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