IMac white 24 inch 2111 video problem

1. Purchased refurbed from Apple
2. Excellent performance, video started to show anomolies
3. Progressed to eventually display going black
4. Sometimes the iMac rebooted
3. 2013 - Apple store genius diagnosed as failed graphics card (GPU)
4. Installed a reburbished GPU assembly, and upgraded internal hard drive at same time
5. Same problem, LED #4 would go black at same time internal display would go black
6. Hook up external display, both internal display and external display go black at same time
7. Asked vendor for a second GPU assembly.
8. Same problem
9. Hooked up external firewire hard drive, used the same hard drive originally provided by Apple
10. Booted to external firewire hard drive, internal display went white, no other progress
11. Put original internal hard drive back into iMac. Now, the only difference is that a refurbed GPU assembly is installed
12. Boot up, I get to the screen to choose an account, I choose an account, and the internal display goes black
13. At least at step 4, when I was booting off the Apple install disk, it would install for 15 - 20 minutes, before the internal screen went black.
14. Always when the display goes black, LEDs 1,2,3 remain light, and the iMac has power because I can see the fans continue to spin.
15. The display goes black so fast, it doesn't "seem" it could be over heating so fast.
So, I don't know what to check next.
I don't want to buy a replacement logic board on the hopes that it fixes the problem, unless I really "know" that is the problem.
It's the common problem of how much money to sink into a failing system, but I've post to iFixit.com and no luck so far.
Thanks for any help.

Welcome to Apple Support Communities
From what we know, your 24-inch iMac has got a replaceable GPU, so you can replace it if you want, and users say it can be replaced by a NVIDIA GeForce 8800 GS, which is supported by iMovie 10.0.
Apple won't help you do that, so you have to get the GPU yourself and install it yourself

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Imac 24 inch compatible video cards

What are compatible video cards to update to? I want to use imovie 10. But it needs something from this list
http://support.apple.com/kb/HT4664?viewlocale=en_US&locale=en_US

Welcome to Apple Support Communities
From what we know, your 24-inch iMac has got a replaceable GPU, so you can replace it if you want, and users say it can be replaced by a NVIDIA GeForce 8800 GS, which is supported by iMovie 10.0.
Apple won't help you do that, so you have to get the GPU yourself and install it yourself

White noise in video problem - Adobe premiere pro 4

Sometimes i face this issue when making projects with Adobe Premiere Pro 4.
Original movie file played with VLC player looks good - like "converted" (just converted using external program, codec H.264/Mpeg4) in Premiere.
But original movie from camera in Premiere sometimes (that's very random) looks like with white splashes or so. (00:01 ; 00:11 ; 00:17)
What's the problem? It consumes alot of time to convert alot of videos, maybe there's a bypass in this issue?

>original movie from camera in Premiere
What IS your original movie?
Codec & Format information, with 2 links inside to read
-read both links in reply #1 http://forums.adobe.com/thread/1270588
Report back with the codec details of your file, use the programs below... A screen shot works well to SHOW people what you are doing
http://forums.adobe.com/thread/592070?tstart=30
For PC http://mediainfo.sourceforge.net/en or http://www.headbands.com/gspot/
For Mac http://mediainspector.massanti.com/

IMac 24" Bootcamp scrambled video Problem in Windows Setup.

I just got a new iMac 24" today and was wondering if anyone else's iMacs are exhibiting display problems in boot camp (see picture links below and description) while in the windows setup screen or other LOW RESOLUTION screen modes.
http://disgruntleddesigner.com/imac.JPG
http://disgruntleddesigner.com/imac2.JPG
http://disgruntleddesigner.com/imac3.JPG
In low resolutions screen modes used by windows setup and the windows boot screen, the display is completely scrambled with moving pixel artifacts such as black vertical lines and misplaced color pixels all over the place.
The computer is a brand new 24" iMac 2.4 with all the latest OS updates. I called Apple's tech support and explained the situation and as soon as the tech rep heard the word bootcamp
he essentially turned his ears off. While I understand Apple doesn't support bootcamp I'm pretty sure this is a hardware/firmware issue and NOT a bootcamp thing.. but they suggest I write here instead of bothering them... so here's my plea for help.

Update.. I exchanged the computer for another at Best Buy and this one does NOT have this issue. I suspect it's a firmware or hardware thing after all.

24" iMac Video Problem on Window XP

I brought 2 units of 24” iMac last month and using boot camp to install windows xp. Both iMac are completed the installation of window xp and one of the iMac run normally but video problem found on second iMac. After running in window xp about 5 – 10 mins, the screen images distort suddenly. If computer restart again, the display will become normal for 5-10 mins and distort again. But the second computer runs normally in Mac OS. Please kindly help….

Are the driver installed, or installed properly?

Yosemite video problems and crashing on Mid-2010 27-inch iMac

I have an iMac (27-inch, Mid 2010) running a 2.93 GHz Intel Core i7 processor with 12 GB 1333 MHz DDR3 RAM, 2 TB hard drive and the ATI Radeon HD 5750 graphics with 1024 MB VRAM. Ever since upgrading to Yosemite v. 10.10.1 I've been experiencing extreme instability with frequent full lockups requiring hard power offs and video pixelation issues with radom 1/8" green and purple squares flashing randomly on the screen. I've reinstalled Mavericks on an external drive and when booted from it experience no issues at all. So the problem is not hardware, it's a problem with the Yosemite OS. When is Apple going to address this issue and come out with an update to Yosemite to fix these problems? My iMac is almost useless now.

Try a restart.
Do a backup, using either Time Machine or a cloning program, to ensure files/data can be recovered. Two backups are better than one.
Try setting up another admin user account to see if the same problem continues. If Back-to-My Mac is selected in System Preferences, the Guest account will not work. The intent is to see if it is specific to one account or a system wide problem. This account can be deleted later.
Isolating an issue by using another user account
Try booting into the Safe Mode using your normal account. Disconnect all peripherals except those needed for the test. Shut down the computer and then power it back up after waiting 10 seconds. Immediately after hearing the startup chime, hold down the shift key and continue to hold it until the gray Apple icon and a progress bar appear and again when you log in. The boot up is significantly slower than normal. This will reset some caches, forces a directory check, and disables all startup and login items, among other things. When you reboot normally, the initial reboot may be slower than normal. If the system operates normally, there may be 3rd party applications which are causing a problem. Try deleting/disabling the third party applications after a restart by using the application un-installer. For each disable/delete, you will need to restart if you don’t do them all at once.
Safe Mode - Mavericks also Yosemite
Safe Mode - About

Hello to all: My iMac has developed a video display problem. It displays everything in cartoon like colors - purple, green, blue. Can this be repaired? Is there a way to output to a different monitor? Thanks in advance! isplays

Hello -
My iMac has developed a video display problem. Everything now appears in a strange, cartoonish way. Purples, greens, blues. Can this be fixed, and if so, any idea how much it might cost? Also, could I output to a seperate monitor? I plan to replace the unit , but cannot right now. Thanks!

Go to System Preferences > Universal Access > Seeing.
In the Display area, reset it to "Black on white" by clicking that checkbox.
You can also reset it by pressing Command-Option-Control-8

Problem High running Temperature Specification iMac 27 inch Mac OS X Includes Software Snow Leopard upgraded to Mountain Lion OS X 10.8.03 (1278) 251 GB Flash Drive 2 TB Sata disk Processor 3.4 Ghz Intel Core I7 Memory 16 GB 1333 MHz DDR3 Graphics

Problem
High running Temperature
Specification
iMac 27 inch
Mac OS X Includes Software Snow Leopard upgraded to Mountain Lion OS X 10.8.03 (1278)
251 GB Flash Drive
2 TB Sata disk
Processor 3.4 Ghz Intel Core I7
Memory 16 GB 1333 MHz DDR3
Graphics AMD Radeon HD 6970 2048 MB
Video: Software Final Cut Pro X 10.0.8
I use the imac mainly for editing Video which when doing so it has reached temperatures of near to 60° C which causes the program to become unstable and needs to be cooled down to operate correctly.
An Apple technician (by phone) advised me to download an smcfancontrol. This allows each individual fan to increase speed and also advises the current temperature at °C. The smcfancontrol has been downloaded but this has not resolved the problem. By increasing the speed of the fan more heat is generated and creates additional noise.
I have since taken the iMac to an Apple Store for examination as suggested by APPLECARE when the fans were found to be working correctly. An Apple Store technician carried out a test, but not whilst working under the pressure of FINAL CUT PRO when the iMac generates a high temperature.
The Temperature Specification for this model is
Operating Temperature 20 °c to 35°C
Storage Temp.47°c
Clearly the temperature my iMac is operating at is excessive and could cause the computer to break down prematurely. Has anyone experienced this problem.
Frank Howell

When was the last time you cleaned/vacuumed out all of your iMac's vents, slots and ports.
You need to do this with the iMac powered down, disconnected from power and everything disconnected.
Lay your iMac, screen down, on a soft surface, like a heavy towel. Use a small electronics vac, or portable or full size vac with hose and a crevice tool attachment and carefully and slowly vacuum every vent, slot and port on your iMac.
Then reconnect everything up, power up and download and install iStat Pro. Start working, then report the temps of your iMac after this has been done.
When using SMCFan Control, it is important not to run the fans at too high an RPM. This doesn't generate heat on its own, but will suck in more dust, lint and dirt into your iMac, and that will be the cause of additonal increases in heat.
I run my fans in the range of 1400-1600 RPMs. You can go as high as 1800 RPMs but it is important to keep the RPM range below either 1800 or below 2000 RPMs.
I, also, run a very small desktop fan pointed toward the upper back of my iMac to keep temps down even further.

I have a iMac (20-inch, Mid 2009). On start up It will sit at the White screen with the logo and the wheel that spins under it. It will not go past this point? Any ideas?

I have a iMac (20-inch, Mid 2009). On start up It will sit at the white screen with the logo and the wheel that spins under it. It will not go past this point? Any ideas?

Question (?) Mark, Blinking Folder, or Gray Screen at Startup
These are related but not identical issues. Their causes are outlined in Intel-based Mac- Startup sequence and error codes, symbols. Solutions may be found in:
A flashing question mark appears when you start your Mac
Mac OS X- Gray screen appears during startup
In most cases the problems may be caused by one or more of these:
a. Problem with the computer's PRAM - See Resetting your Mac's PRAM and NVRAM.
b. Boot drive's directory has been corrupted - Repair with Disk Utility.
c. Critical system files are damaged or deleted - Reinstall OS X.
d. The disk drive is physically non-functional - Replace the hard drive.
Note that the information I have provided is what Apple recommends, If other users suggest different solutions than found here, then be sure what they recommend does not impact on your warranty, if any, or ability to get continuing Apple service.
Please don't start removing drives or changing cables unless you know what you are doing and have exhausted other non-invasive alternatives outlined here. If you perform any work yourself that is unapproved by Apple, then you will void any warranty you may have and lose all further Apple Support.
Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
The main difference if you are using Lion or Mountain Lion is that you must first boot from the Recovery HD. Simply boot from the Recovery HD to perform the above.
Reinstall Snow Leopard Without Erasing The drive
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install Mac OS X 10.6.8 Update Combo v1.1.
Reinstalling Lion/Mountain Lion Without Erasing The Drive
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.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

Hello I have imac (27-inch mid 2011) 3.1ghz intel core i5 1tb serial ata hard drive, amd radeon hd 6970m my problem is imac works fine in safe mode,but when you try to startup normal it's connstantly restart by it self.

hello I have imac (27-inch mid 2011) 3.1ghz intel core i5 1tb serial ata hard drive, amd radeon hd 6970m
my problem is
imac works fine in safe mode,
but when you try to startup normal it's connstantly restart by it self.

in safe mode works perfectly,soon as I try to boot in normal mode it's keep restarting.on screen I don't see any line vertical or horizontal picture look normal on safe mode.but unable to start normal it just restarting over and over.I try another HDD but same things happen,I replace memory but still same.works ok in safe mode but not in normal mode.I will try to post system error report.

Hi,,does the new 2011 imac 27 inch U.S version support any pal signal inputs as video or hdmi through the video recorder device or kanex xd ?

Hello,,
I have 1 question please,,,
does the new 2011 imac 27 inch from USA support or lay any PAL signal ??
as for example
I have a friend who lives in the middle east & has kanex xd & he wants to connect it with the imac 27 inch from Satellite receiver or PS3 though HDMI cable,, but yet the signal is PAL not NTSC in the middle east,, so will the imac 27 inch play the movie from the satellite in full colour or in blue & says cannot play the movie because its not NTCS ? because this is U.S version of imac then he might need an convertor?
the same as if he want to record any hdmi or analog device from his video recorder device,,but the input is pal,,so will it plays normal in the U.S machine or will he find any trouble ???
so can you pls give me an advice for him
should he buy the imac from the U.S store or the europe store ??
N.b : there is no mac store ONLINE in the middle east espicaly in Gulf, thats why he want to buy the imac from the mac store online,,
and thank you

Hello,,
I have 1 question please,,,
does the new 2011 imac 27 inch from USA support or lay any PAL signal ??
as for example
I have a friend who lives in the middle east & has kanex xd & he wants to connect it with the imac 27 inch from Satellite receiver or PS3 though HDMI cable,, but yet the signal is PAL not NTSC in the middle east,, so will the imac 27 inch play the movie from the satellite in full colour or in blue & says cannot play the movie because its not NTCS ? because this is U.S version of imac then he might need an convertor?
the same as if he want to record any hdmi or analog device from his video recorder device,,but the input is pal,,so will it plays normal in the U.S machine or will he find any trouble ???
so can you pls give me an advice for him
should he buy the imac from the U.S store or the europe store ??
N.b : there is no mac store ONLINE in the middle east espicaly in Gulf, thats why he want to buy the imac from the mac store online,,
and thank you

When I try to play videos on Apple's website, "missing plug-ins" appears. The same happens when I try to play Apple trailers. Other "users" on the same iMac don't have this problem.

When I try to play videos on Apple's website, "missing plug-ins" appears. The same happens when I try to play Apple trailers. Other "users" on the same iMac don't have this problem.

Thank You, Thank You, Thank You! Your solution worked straight away. I've been battling with this for weeks'
Thank you again. :-))

IMAC 24 Inch Video Question

Does the Imac 24 inch video card have
floating point texture support.

Hi Russell,
According to various internet sites, the chipsets in two cards available for the 24 inch iMac, the Geforce 7300 GT and Geforce 7600 GT, both support "floating point texture". I can't find any specific references to the implementation in the Apple 24 inch iMac Intel, but I would doubt it is delibrately removed.
So, what good that actually does you is anyone's guess, but yes, it seems to be in there.

My iMac 20 inch 2.4 has developed a very annoying flicker. It looks like somebody is messing with the brightness but than really quick. Any ideas on how to solve this problem ?

My almost four year old iMac 20 inch 2.4 ghz Intel Core 2 Duo has recently been giving me a headache. The screen is flickering a lot. It looks like somebody is messing with the screen brightness at a really fast rate. I have no idea what it could be but have tried to recalibrate the screen, stopped certain dashboard apps, even changed the desktop picture and screensaver. Has anybody else had the same problem or could somebody help me in getting rid of this flicker. It feels like it is a software issue as it happens intermittently rather than continuous.
Pleas help me !
Gersom

My almost four year old iMac 20 inch 2.4 ghz Intel Core 2 Duo has recently been giving me a headache. The screen is flickering a lot. It looks like somebody is messing with the screen brightness at a really fast rate. I have no idea what it could be but have tried to recalibrate the screen, stopped certain dashboard apps, even changed the desktop picture and screensaver. Has anybody else had the same problem or could somebody help me in getting rid of this flicker. It feels like it is a software issue as it happens intermittently rather than continuous.
Pleas help me !
Gersom

IMAC 20 INCH INTEL WHITE USB PORTS DONT WORK

i have a 20 inch intel imac white and my usb ports dont detect any of any external devices such hard drive and camera or usb flash ,but my keyboard and mouse are detected and work .I already did a smc reset and pram and they show up under the apple profiler and i created a new user and tried it from there still nothing .Will a power usb hub fix this issue ,i think its a low voltage issue any suggestions.I have tried all the ports as well all the same
Message was edited by: s281er238

Hi Enialreve,
Thanks for posting and welcome to the Lenovo Community,
I’d like to help you with the issue that you’re facing and I need to confirm you that all the steps that you’ve done is absolutely correct,
And as I can see that you’ve followed all the steps that we can do inside the operating system,
And I’d like to advise you that we can try to perform a recovery to get the machine back to the initial state and am sorry to ask you to take a backup from the data you need as the recovery will get the machine back as a new machine and all the Data on C: partition will be lost,
Kindly turn off the machine and connect the charger and the battery and then press on the One key recovery button which is the small one with the curve arrow,
And then the system will be booting to the recovery,
For more information about the recovery check the below link:
One Key Recovery
Hope the information helps. Let us know.
Regards
Soha
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IMac white 24 inch 2111 video problem

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