Alternating pixels turned-off of iMac LCD

I have a 20" iMac Core2Duo from 2006 where half of the internal pixels just turned off (look like black vertical lines across the entire screen, where it alternates from a vertical line of pixels turned on to another turned off, etc). It doesn't look to be a software problem since I booted up from a Ubuntu linux CD and the lines were still there. Changing the video resolution and resetting the PRAM do not make any difference. This seems to be different than the other lines people on these boards complain about regarding the iMac.
I attached an external monitor and it works fine (no lines), but was wondering if anyone else had something similar happen and if it was a graphic card problem, blacklight, connector, etc? Any tips to help me determine to spend the money to look for the problem or not would be appreciated.

The problem is that it does not work with the 'Apple ram' either. And I have tested the ram in my Macbook with succes, so that does not seem to be the problem.
I just turned it into another service provider today, but I really doubt that they will come to another conclusion...
The problem is that Apple got no shop in Denmark, and therefore Apple need to send a CAS number to hte service provider to legimitate that they can do the repair without any cost for the consumer. But I dont quite know whenever the service provider shall request the CAS number from apple upon finished diagnose or I shall contact Apple and then convince them that they shall send the CAS to the service provider. :/
But do anybody know if I am the only one? I have seen on this forum that there is a few but is it like a big problem?
/morten

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My external hard drive stays on even after I turn off my iMac. Why?

New 24” iMac (see below)
I have connected my 800 Firewire LaCie 500 Gigabyte external hard drive and it works fine. However, it doesn't turn off after I have turned off my iMac! I used Tiger before this and the very same LaCie external drive always turned off (its blue light would go off).
I am sure that my iMac is Off and is not actually still On.
Please advise, because I am not sure what could happen to my LaCie hard drive if it stays on constantly.
As for the iMac, since the instructions mention turning if off, I figure that turning it off is not harmful. Various people at the Apple Store have told me that keeping the iMac on 24 hours a day is not detrimental to the machine but I am old fashioned, I guess...... with that old fashioned paranoia about letting machines stay on all day. If I am wrong, please tell me.
~ Lorna in Southern California

Dear Dennis at LaCie support: Thank you so much for your reply. I did what you said and did indeed discover that when I unplug the LaCie 500 gig hard drive from my iMac, the hard drive turns off, which proves that there is powering still sent through the FireWire bus. It did not turn off with Tiger on my older iMac (the round white semi-circular base iMac).
BTW: I also have a LaCie 125 gig external hard drive bought several years ago. I am assuming that it has a FireWire which is rated at that 400 rather than the 800 that my 500 gig hd has. Am I right? If yes, then I will look for the cord that matches that hd. I hope that LaCie prints the number on the cord because if not, I will have a hard time.
I do see that on the new 24“ Intel iMac, the 800 port is the one farthest to the right in the back of the iMac, and the 400 port is to the left of it.
Wish me luck. I still have to figure out how I will use the 125 gig. I am now using the 500 gig for the Time Machine backups and the .Mac Backup. Also, other of the usual.
Thank you again,, Dennis. Makes me glad I bought La Cie hard drives.
I hope that the smaller one doesn't fritz up on me, since I bought it several years ago.
~ Lorna in Southern California

HT4413 I migrating from my macbook to new imac. nothing showed up until I turned off the imac but everything I had done previously on the imac disappeared.

I was migrating from macbook to a new imac.
Nothing showed up until I turned off the imac.
When I restarted the imac everythign I'd previously done was gome and the migrated macbook desktop had taken over.
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Thanks

You can't. When you migrate user accounts, those settings will be used. That's the point of migrating, not to have to reset things Peruse Pondini's Setup New Mac guide for details.
If you want to revert to the original user settings, create an new admin user account. That'll use the default user setup.

Turn off the iMac display

Can i turn off the iMac display if i want use only external monitor?

Sorry, OS X doesn't allow for that.

HT201343 can i turn off my imac monitor while airplay from it to my tv?

can i turn off my imac monitor while airplay from it to my tv?

You can just turn your brightness down to 0. Only thing I have figured out so far.

Turning off your imac

should i turn off my imac at night?

It is your preference. Read the user manual for sleep & turning off recommendations.
Some folks keep their Macs on 24/7/365 days a year. However, it is highly recommended (user manual) that if you will be away from your computer more than 24 hrs, to shut it down (off).
Again, it's a personal choice. "Different strokes for different folks." Me personally, I follow the user manual recommendations. Works for me!

How do I turn off airplay iMac ATV3.

2011 iMac (Mavericks) + ATV3
It is not connected to anything but the icon is still blue and it says it is connected to my ATV.
I know its not connected as I am looking at the ATV now and can see and interact with the GUI.
I went into display settings and tried to turn it off from there, but it will not turn off.
I removed the icon from my menu bar.
I have turned off the ATV for over 5 mins.
This is not an isolated incident, this has been happing for about 2-3 weeks now.
Very annoying.
Any ideas or links to this, if it has been answered already
P.S.
As I write this i see it has disconnected (ATV has been off for about 8-10 mins now)

Turn off mirroring.
http://i1224.photobucket.com/albums/ee374/Diavonex/dc03b4b4c3345915476c59fe98c34 d01_zps3e9b85e4.jpg

Turning off the imac

every time I use my iMac and I want to turn off my computer later, it doesn`t work and I have to put out the electric cabel to turn off my computer. This is not good for the hard drive. But what can I do instead? How to get out of iMac?

Suggest that you cross post over in the iDisk Forums where the iDisk users hang out.

I can't turn off my IMAC and can't open my email

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My iMac is frozen on a blue screen during an update software for snow leopard. What do I do? Turn off my imac?

My iMac is frozen on a blue screen during an update of software for snow leopard. What do I do? Should I turn off the computer?

do a hard shutdown of the mac (holding down the power button until it shuts off) then do an SMC reset, the following article tells how to do this:
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MPB Display/keyboard turning off with external LCD hooked up

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Seemingly at random, the MBP appears to go to sleep (despite the fact that I've got sleep turned off in the power manager). The MBP screen shuts off, the keyboard stops responding (or lighting up if I cover the ambient light sensor) and the trackpad likewise simply doesn't work. The green LEDs for Caps Lock/Num Lock do work. The external keyboard and mouse still work, and the Dell LCD monitor still works (in fact that's how I'm posting this now); however, extended desktop no longer works and anything I was doing on the MBP screen is pretty much forever lost, as I've been utterly unable to find a way to force the MBP screen back on.
To compound this, if I unhook the DVI connector from the MBP, the MBP display comes back on; however, the display is horribly garbled and impossible to read. After seeing this, I plugged the DVI connector back in which promptly froze OSX. The only way I've been able to fix this is a hard reboot. If I look closely at the MBP screen, I can see that both backlights are still on and that the LCD simply isn't displaying an image.
This is hooked up to AC power, not on battery.
I'm desperate for help here, any advice would be greatly appreciated.
Edit: Just noticed that when I drag a window off my working display (the Dell) past the boundary that would be the extended display on the MBP, OSX crashes and requires a hard reboot.
Macbook Pro Mac OS X (10.4.7) 15.4" 2.0ghz

I have a similar problem with a Mini, whose BT reception seems awfully poor with the new AL keyboards and a "Lost Signal" message will appear every 5 minutes (I already replaced the KB once and no dice).
The solution for not having it turning back on the computer is to check off "Allow Bluetooth devices to wake this computer" (System Preferences > Keyboard & Mouse > Bluetooth). Note that in doing this you won't be able to hit the keyboard to wake the computer... anyway, I think the real problem isn't that your KB goes to sleep, but that it breaks the wireless link, so the computer complains, your problems does not seem as severe as mine, though.
Message was edited by: rndm

Can i turn off my imac screen while airplay mirroring?

Wehn i use the key combination shift+ctrl+eject the picture on my apple tv freezes. Is there a other way to disable the imac screen? Thanks

Hi,
I did try to search for this question but could not find. Just got Apple TV 3rd Gen. I wanted to watch streamed sports via web and the Airplay works ok but when I try to knock off the iMac screen the TV screen also goes blank. I'm guessing I have to live with this and only iTunes content will allow me to knock off the computer screen?
Flan

With Firefox 18.0.1, the browsers continues to crash. I have tried all alternatives from turning off all add-ons to resetting the browsers. What next?

With any one solution, it appears fixed but then begins to crash again. It crashes at start-up. It crashes as I move from one page to another. It crashes after being on for several minutes or sometimes for better part of an hour. It has little to do with video retrieval or any one page or speed of changing from one to another page. It has gotten worse and worse with each new upgrade and seems to have started with upgrades after 14.0. I have to believe the problem is embedded in Firefox rather than any of the suggested solutions put out by Mozilla. At present, I have all add-ons and plug-ins disabled. I am prepared to uninstall Flash and Java if that would help. I prefer Firefox but it seems Mozilla does not appreciate the frustration of not have someone, other than me, solve this problem. Any suggestions? Thanks.

Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.
Do a malware check with some malware scanning programs on the Windows computer. 
You need to scan with all programs because each program detects different malware.
Make sure that you update each program to get the latest version of their databases before doing a scan.
*Malwarebytes' Anti-Malware: http://www.malwarebytes.org/mbam.php
*SuperAntispyware: http://www.superantispyware.com/
*Microsoft Safety Scanner: http://www.microsoft.com/security/scanner/en-us/default.aspx
*Windows Defender: Home Page: http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
*Spybot Search & Destroy: http://www.safer-networking.org/en/index.html
*Kasperky Free Security Scan: http://www.kaspersky.com/security-scan
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How come everytime I turn off my imac it turns of my airport extreme base station for about 1 minute?

I really need advice, Im really getting annoyed by this even though its 1 minute. Any advice?

Try Resetting the AirPort Base Station

Is it possible to turn off imac display while mirrored display plays video?

I've set up a new 21.5" imac for my parents use in their living room and have connected their 52" lcd tv to the imac as a mirrored display.
One issue that i can't find a solution to is to find a way to turn OFF the imac display when they're watching content on the lcd tv. If they want to watch a film from the imac out to the LCD TV, they want to dim the lights and watch it, but the imac display being on in the dark room is distracting.
Is their any way (3rd party software??) to turn off the imac display while still being able to have the mirrored display running?

You should actually NOT use mirroring, although it would work OK on the 21.5-inch iMac because the screen resolution is identical to 1080p HDTV.
In System Preferences Displays pane Arrangement tab, turn mirroring OFF. This makes the HDTV screen extend the iMac's Desktop. In the diagram on that pane, it shows how the two screen arranged. The edge where they touch is where you can move your mouse cursor from one screen to the other. You can move the two screen around in the diagram, to match how the iMac and HDTV are located in the real world.
In System Preferences Displays pane Display tab, there will be a window for each screen. The 21.5-inch iMac's screen should be set to 1920x1080. The HDTV's screen should be set to 1920x1080 also, if it is a "1080p" HDTV.
To watch video content on the HDTV, first show the video playing in a window. Drag the window to the HDTV screen so that it is completely on that screen. Give the full screen command (usually Command-F). The video will play in full screen mode on the HDTV screen. In most video playing applications, such as DVD Player, QuickTime Player, iTunes, etc., the other screen (the iMac's screen in this case) will go black. It's not OFF, but it will display black.
Note: Some video playing apps have a preference setting for which screen gets the full screen. When playing video content in a browser window (such as YouTube or Hulu), when you go to full screen mode by clicking the +full screen+ button, the other screen will not go black.
As far as I know, there is no way to turn off the iMac display, even with mirroring turned OFF.

Alternating pixels turned-off of iMac LCD

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