Why is my iMac computer screen displaying vertical blue and pink lines through it?, why is my iMac computer screen displaying vertical blue and pink lines through it?

My iMac which is but a few years old at this point is displaying vertical lines thru the computer screen, what is this and what can be done about it?

Do you get the same result starting in Safe Mode ?
As old as your iMac is, have you cleaned out the dust? Dust buildup can lead to over heating issues. Remove any and all things plugged into it including the power cord, Remove the RAM access grille. Vacuum all openings starting with the RAM access area (air intake). Vacuum all ports and plugs, DVD slot and the opening across the top of the rear of the body. Blow compressed air through all your openings and vacuum again to remove any dust you loosend. Reinstall the RAM grille. Plug in the keyboard and mouse if not blue tooth. Insert power cord...
You are now in a perfect position to do a
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
It is the 5 second timing that initiates the reset.
Here is a Widget to monitor your temps and other operations:
http://islayer.com/apps/istatpro/

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What could be wrong with my iMac? When switched on the screen displays the apple logo with a busy bar at the bottom of the screen. This displays the progress of the computer trying to do something. To fill the bar takes about 30 mins and then switches off

What could be wrong with my iMac? When switched on the screen displays the apple logo with a busy bar at the bottom of the screen. This displays the progress of the computer trying to do something. To fill the bar takes about 30 mins and then switches off

Which OS X is installed?

Why has my monitor suddenly begun to have a moiré pattern all over – it is even showing up on my icons on the dock? It appears to be very thin bright green vertical lines. I have a 2008 iMac which is running 10.6.8. What does this mean?

Why has my monitor suddenly begun to have a moiré pattern all over – it is even showing up on my icons on the dock? It appears to be very thin bright green vertical lines. I have a 2007 iMac which is running 10.6.8. What does this mean? I've attached some screen shots below.
Also experiencing some funky issues with my wireless keyboard. With new batteries, it will just stop functioning. Certain keys intermittently won't work. Also the fans go on as soon as I turn the computer on - some times they stay on and sometimes they don't. Ever since upgrading the operating system - I've been having many issues with this iMac. Not happy. Any answers out there?

Thanks for your reply LexSchellings, There is no disc in the drive and I went through the suggestions you put forward on the phone with Apple support without any luck. I can put a disc in but it pops straight back out again without registering on finder.
The idea of using an external drive was to enable me to avoid the cost and loss of productivity whilst machine in repair... if I have to take it in to get the old drive removed than I might as well have a new internal drive put in, although I do worry about the reliability of these apple drives given my experience with this one coupled with my limited online research ... on line forums seem to be full of people with the same problem (although perhaps searching such forums is bound to make it seem a common problem as users with perfectly working machines are less likely to post (?)) Your reply suggests that no external drive will work whilst the existing drive is in place.
As a postscript: I do realise that this is a user forum ...my secondary question was asking if anyone knows how to put forward a case/complaint to Apple... I can't find a link on the support page that would enable me to do so and I was wondering if anyone on this user forum had any ideas/experience..

I have a red vertical line on the right side of my screen and it will not go away tried restarting my computer and that didn't help at all, please help me with this problem it is kind of annoying

I have a red vertical line on the right side of my screen and it will not go away tried restarting my computer and that didn't help at all, please help me with this problem it is kind of annoying

If it's a thin 1 pixel wide vertical line it's highly likely it could be caused by a defective LCD.
One quick basic way to check is to note the position of the line. Then go to System Preferences, Displays, and lower the resolution. If ther line moves it's on the video and the logic board or video card if fitted is likely to be defective. If the line stays in the same position it's likely to be an LCD fault. Either way to have it repaired you'll need to visit an Apple store or AASP.
The worst offender for this problem is the Late 2006 17" iMac. FOC replacement of the LCD used to be covered by a quality program, but it's now ended.
Steve

Why does my screen turn blue and freeze every time i try to plug in my 'mini display to hdmi' cable into my thunderbolt port in order to use an external monitor?

why does my screen turn blue and freeze every time i try to plug in my 'mini display to hdmi' cable into my thunderbolt port in order to use an external monitor? it only works if i turn the computer on with it already plugged in.

Do you have gfxCardStatus installed? Is your monitor set to "Integrated" or "Discrete". You want it set to Discrete to drive the external HDMI display.
Try resetting the PRAM and SMC
<About NVRAM and PRAM>
<Intel-based Macs: Resetting the System Management Controller (SMC)>
Are you sure you have a good miniDisplayPort to HDMI cable?
Do you have another HDMI display you can test against (your neighbor's HDMI capable TV).
Do you have friend that can test the cable using their Mac and maybe their TV or a monitor that has HDMI input.

My apple tv is registering on my tv - i can see it on my system info screen but the apple tv doesn't show up, as well my imac doesn't seem to let me share - so i don't know whats wrong, why my apple tv isn't working

anybody able to help me with my setup for apple tv. i've followed the directions in the guide and my tv doesn't seem to register in part. it's weird because my tv system info identifies the apple tv but the screen never went black and it doesn't show anything, too, my imac doesn't seem to register the apple tv unit either

I would try connecting it to another tv to see if it works there if it does
then likely your tv can't handle the default resolution and you should lower it on the other tv
if not then you should connect it by usb to the computer and use itunes to restore it's firmware

I have IMac 10.7.5 Lion I use I forgot the password and I did a few fixes from the we sites, which did not work and now I can not get the computer to reboot the gray screen comes on and if a shift c I get a load bar and it goes half way and help

I have IMac 10.7.5 Lion I use I forgot the password and I did a few fixes from web sites, which did not work and now I can not get the computer to reboot the gray screen comes on with the apple and if a shift+c, I get a load bar and it goes half way and stops, I can get into the black screen area with the hard drive info
I did the following:   mount -uw /    rm/var/db/.AppleSetupDone    shutdown/uses/us reboot Ok I know I should not have, but now I need help to reboot and hopefully not lose everything on the desk top, Linda Markle

You did the wrong things. In the future it's a good idea to remember not to do something when you don't know what you are doing and what happens when you do it.
Forgot Your Account Password
For Lion, Mountain Lion, or Mavericks
    Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
     When the menubar appears select Terminal from the Utilities menu.
     Enter resetpassword at the prompt and press RETURN. Follow
     instructions in the dialog window that will appear.
     Or see:
       Reset a Mac OS X 10.7 Lion Password
       OS X Mountain Lion- Reset a login password,
       OS X Mavericks- Solve password problems,
       OS X Lion- Apple ID can be used to reset your user account password.

HT3275 Hi, I have backed up 2 IMACs and one Mac Book Pro but for some reason, the 3rd IMAC come up with this problem: The backup disk image "/Volumes/Data/Anthony's iMac.sparsebundle" could not be accessed (error -1). Why? They computer system is up to da

Hi, I have backed up 2 IMACs and one Mac Book Pro but for some reason, the 3rd IMAC come up with this problem: The backup disk image “/Volumes/Data/Anthony’s iMac.sparsebundle” could not be accessed (error -1). Why? The computer system is up to date and I have had no issue with the other computers, just this one.
Many thanks
Anthony

Try this Discussion...
https://discussions.apple.com/message/18783684#18783684

Use... I realized that i spent my 27 years for using (fixing) computers. Because the Mac was perfect. After iMac, i was really fine with my computer... But after something, that doesn't bother me, happened. The screen started to get cloudy and black... An

Hi...
My name is Turgay and have been using computer since 1982... 2 years ago, because of my friend's advice, i bought an iMac... It was the first Mac that i use... Till that, i was using normal PC's...
I bought an 24" iMac on July 2009 and started to use... I realized that i spent my 27 years for using (fixing) computers. Because the Mac was perfect. After iMac, i was really fine with my computer... But after something, that doesn't bother me, happened. The screen started to get cloudy and black... And it increased. Because of this i took my iMac to your authorised distributor http://www.bilkom.com.tr...
They changed my screen but in 2 months it happened 3 times and i wanted them to change my iMac with new one, under customer laws... In our country, the device must be changed with new one if the same problem occurs in 3 months. Because i know the customer satisfaction of Apple, i didn' worry about it but Bilkom refused my will... I spoke with them for 2 months but nothing happened, they just told me, it' not our problem.
Because of this speech, i sued them on June 2011... Last week, i won the case but just for the return of invoince... It costs 3.200 Turkish Liras (1.800$) and there's no 24" iMac unused... Bilkom again refused to give me an iMac... I thought that Apple's customer satisfaction can't be like this... I didn't write anything to Apple till now but if i can't get an iMac, i must return to normal PC after 2 years... And i don't want that... I offered an iMac 27" with core i7... No matter Bilkom accepts or not, they don't care of me... I'm a customer, they should do... I've never seen such a like company. I hope the real Apple will help my problem and save me from Bilkom...
Waiting for your reply... Thanks and regards...
Turgay Kala
General Manager

Unfortunately, you are not communicating with Apple here - we are all other users volunteering our time to help with technical problems.
Here is a list of Apple contacts; there is no email address - you will need to write a letter to their corporate headquarters or call them:
http://www.apple.com/contact/
Although, it appears that your problem is with a third party store and that you have won in court - did you get your money back? 24" iMacs have not been made since 2009 or 2010. Now there are 21" and 27" iMacs.

Why my calendar display different there is one day difference from different when I see main screen and open the calendar

See my Why my calendar display different there is one day difference from different when I see main screen and open the calendar

I too am having the same issue only I am in Regina, Canada. iCloud appears to think Regina, Canada is in the Central time zone which it is, but it does not use Daylight Savings time. My PC is Windows 7 and I am using Outlook 2010. I have iCloud on iPhone 5 and iPad 2. Terribly frustrating!

HT2213 I have an IMac about 5 years old. When requested on my screen I downloaded Maverick-everything went fine except when the restart occurred-.the computer would not restart-there was a screen in several languages and asked to wait or push any key-the

Help..I downloaded Maverick on my 5+ year old Imac and after downloading the new program the computer would not restart properly and give me my screen to work on...it gave me an error screen and told me to push a key or wait...tried both ways and then went briefly to black highlighted white letters signaling to me oh crap, something is wrong....it would keep cycling and do the same thing but never allowing me to get back to my home screen, sign in or anything....went to the Apple store and could not get an appointment till Monday....can anyone tell me how to get rid of the download and just let me have control of my computer again? Please help...
Jim

Not good, your machine suffered a Kernel Panic. Please wait until Monday and your Apple Store will try to help troubleshoot your problem. In the mean time you can read the X-Lab's comprehensive article on KP's located at:
http://www.thexlab.com/faqs/kernelpanics.html
Good luck!

When my iphone connect to computer,the iphone screen appears three choices (storage usb,media device,ptp) ,why??

when my iphone connect to computer,the iphone screen appears three choices (storage usb,media device,ptp) ,why??
is that the problem why the iphone cannot connect the itunes?? or click any one to connect with itunes??

Hi Si,
Welcome to Apple Support Communities.
See this article for some troubleshooting tips that can help if your iPhone isn't recognized in iTunes:
iOS: Device not recognized in iTunes for Windows
http://support.apple.com/kb/TS1538
Best,
Jeremy

Imac display problem, the resolution seems to be unusual, top bar and all folders on the desktop background is off the screen

Need help with 21" imac display problem. The resolution seems to be unsual, everything on the desktop background goes off the screen. The resolution is set at 1920 x 1080

Quit the game and restart the iPad.
To quit the game - Go to the home screen first by tapping the home button. Quit/close open apps by double tapping the home button and the task bar will appear with all of you recent/open apps displayed at the bottom. Tap and hold down on any app icon until it begins to wiggle. Tap the minus sign in the upper left corner to close the apps. Restart the iPad. Restart the iPad by holding down on the sleep button until the red slider appears and then slide to shut off. To power up hold the sleep button until the Apple logo appears and let go of the button.
If that doesn't work try this.
Reset the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons.

My iMac screen goes bright and dim randomly, any idea why?

my iMac screen goes bright and dim randomly, any idea why?

Sounds like a power issue.
Try Resetting the System Management Controller (SMC)

File sharing between Mac Mini and iMac "breaks" after reboot of either device, and won't restore. Why? Running Maverick 10.9.1 on both. File sharing is setup on both. Help.

I'm a new user - recent convert from longtime Windows to Apple. Thought having desktops and computing aligned with phones and tablets would help. Not so far.
I have a MacMini running Mavericks 10.9.1, and an iMac running Mavericks 10.9.1. File Sharing is set up on both. If either device is rebooted for any reason, file sharing from the Mac Mini to the iMac "breaks" and will not easily restart. Various things eventually brings the connection back - usually having to do with checking and unchecking File Sharing, the AFP button, and/or the SMB button on the iMac - but never the same procedure twice in a row. File Sharing from the iMac to the Mac Mini is never disrupted - always comes back up without a problem. Screen Sharing also works between both without fail, and comes up after reboot of either. No problem there. Only difficulty is from Mac Mini to the iMac.
Why? Any ideas?

Should also clarify - usually takes multiple hours of checking/unchecking file sharing settings in order to restore the share between Mac Mini and iMac. NEVER happens automatically.
This is disruptive because I've got the Mac Mini pointing to several file locations on the iMac for various things - photos, music, etc. - and they all hang up unless the share is restored. Real bummer.

HT2531 Spotlight lists items and shows preview images. BUT what about showing the location address of an item in my computer. Especially important if I've put the item in the wrong folder and what to locate it without multi-steps. iMac OS 10.5 was more u

Spotlight lists items and shows preview images. BUT what about showing the path/location address of an item in my computer.
Especially important if I've put the item in the wrong folder and what to locate it without multi-steps. iMac OS X 10.5 was more useful.
Old OSX Spotlight function automatically displayed path/location within the machine: e.g. desktop/folder/sub-folder/item.
Can I make Spotlight show the path?

Press option-command and the path is displayed at the bottom of the little preview window. Press command-return and the enclosing folder opens.

Why is my iMac computer screen displaying vertical blue and pink lines through it?, why is my iMac computer screen displaying vertical blue and pink lines through it?

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