Imac 2.4 Ghz intel Core 2 Duo. What is the best OS i can run?

I need to spend some cash on my OS X. I have a version 10.5.8 and a Imac 2.4 GHz Intel Core 2 Duo. 2GB of SDram
What is the best i can DO?

As Niel says 10.8.5 however in order to get the best experience upgrade the RAM to a minimum of 4GB, your system can run 6GB which can be purchased from OWC (www.macsales.com).

Similar Messages

I have an Imac 2.8 GHZ Intel core duo, a month ago during booting instead of the apple, appear a world picture, since Is this normal?? also i feel the computer much slower since then, does any body know what is this?

I have an Imac 2.8 GHZ Intel core duo, a month ago during booting instead of the apple picture appears a world picture and takes a lot of time to start, Is this normal?? also I feel the computer much slower since then, does any body know what is this? How can I fix this? Thanks

Gomtomsyetm preferencs and make sure that you HDD is selected as the start up disk. Then start up using your install disc and run disk utility and repair the drive just in case something has gotten corrupt.

I'm using iTunes 10.6.1 on an iMac 2,66 Ghz intel core Duo with8GB DDR3 and Lion 10.7.3 I hav 260000 mp3 stored on A My Book 3 TB external Fire wire 800 Drive - when I play songs I get short interuptions every 20 to 30 seconds. Can't iTunes handle that?

I'm using iTunes 10.6.1 on an iMac 2,66 Ghz intel core Duo with8GB DDR3 and Lion 10.7.3 I have 260000 mp3 stored on a My Book 3 TB external fire wire 800 Drive - when I play songs I get short interruptions every 20 to 30 seconds. Can't iTunes handle that number of songs?

I'm using iTunes 10.6.1 on an iMac 2,66 Ghz intel core Duo with8GB DDR3 and Lion 10.7.3 I have 260000 mp3 stored on a My Book 3 TB external fire wire 800 Drive - when I play songs I get short interruptions every 20 to 30 seconds. Can't iTunes handle that number of songs?

I have an iMac 1.83 ghz Intel Core Duo. The sound is suddenly intermittent, the magic mouse erratic. I'm running OS X 10.6.8. How do I correct this? Will Lion run on this machine?

I have an iMac 1.83 GHZ Intel Core Duo. The sound is suddenly intermittent, the magic mouse erratic. I'm running OS X 10.6.8. How do I correct this?
Will Lion run on this machine?

Unless you have an intel core 2 duo processor or greater, you can not run Lion
General requirements-Lion
Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor
2GB of memory
OS X v10.6.6 or later (v10.6.8 recommended)
7GB of available space

Have Mac OS 10.7.4 installed on an iMac-3.1 GHz Intel Core i5...the Finder will not find file on Windows mounted volumes...what setting should we be using...tried the same settings as our iMac 10.6.8-did not work!

Have Mac OS 10.7.4 installed on an iMac-3.1 GHz Intel Core i5...the Finder will not find files on Windows mounted volumes...what setting should we be using...tried the same/working settings as our iMac 10.6.8...did not work for 10.7.4!

Added note: We are tring to find files on Windows 2008 Server Standard...

I have an old imac 1.83 GHz Intel Core Duo, can I upgrade to Mountain X lion?

I have an old imac 1.83 GHz Intel Core Duo, that still runs on OS X 10.4.11, can I upgrade to Mountain X lion? Is my Iphone with Ios6 will work on it?

1. No.
2. Yes. Phone the online Apple Store, order a Mac OS X 10.6 DVD, install it, and run Software Update.
(70502)

I have a Mac running OS X 10.4.11 with a 1.83 intel core duo what is the highest operating system upgrade that I can get?

I have a Mac running OS X 10.4.11 with a 1.83 intel core duo what is the highest operating system upgrade that I can get?

You can check to see if yours meets the system requirements for Snow Leopard - that would be the highest; Lion will not run on your machine.
Please note that the minimum 1 GB RAM is a minimum - 2 GB would be better.
http://store.apple.com/us/product/MC573Z/A
You can buy it at the Apple Store, other online resellers, or ebay (but be careful there to only bid on a new retail shrinkwrapped package to you don't get suckered into a used install disk which won't work on other machines).

My Imac 2.0 GHz Intel Core Duo keeps powering off

Hi all,
I have a 20inch 2.0 GHz Intel Core Duo (Imac 4.1), Over the last few weeks the Mac would just power off on the odd occasion when using Apeture, I put this down to being the just overworked for processing picture. This seems to have been getting worse and kept occurring more and more often. Light Internet browsing was fine..
I decided after some time to replace the 2gb memory i had to see if that would fix the issue, this seemed to work for a few days then the same issues returned.
I now seeing this issue occured just by opening Safari and decided to rebuild the Imac, I completed the Snowleopard install and all seemed ok for a day then it re-occurred again and seemed to be worse, I then removed the 2gb memory and just kept with the 512mb as when bought... Still it keeps powering off. I have moved to different power sockets and still see the same issues.
Please note in order to power the Imac backup up I have to leave the power out for about 20-30 minutes, If i leave the power plugged in it never boots backup up.
I now decided to even revert back to Lion OS, but it just powers off during the install...
I thinking it sounds like a Power supply issue but would like confirmation before I take it to a repair shop..
cheers
Dan.

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 link to a Widget to monitor your temps and other operations:
http://islayer.com/apps/istatpro/

Photoshop CC and Illustrator both not supported by this type of Mac. I have iMac, 10.6.8, 2 GHz Intel Core Duo, 2 G memory. Any solutions to run it on this?

Possible to run either of these on my iMac?
I use OS 10.6.8
2GHz Intel Core Duo
2GB memory

System requirements for individual Cloud Programs
-http://www.adobe.com/products/creativecloud/tech-specs.html#requirements
If what you have is not listed for the program(s) you want to run, I don't think you will be able to run the programs

Imac 2.4 ghz intel core duo identification 7,1,

I want to upgrade my hard drive. what is the largest one I can get?

Sidney,
I have the same iMac 7,1 and have upgraded the internal drive to 3TB.
Yes, you will need suction cups. You can source them from an auto parts store. The suction cups used to pull out dents from car panels will work to lift the glass from your iMac. This is the most daunting task, but in the end was simple enough with suction cups.
You can search google for instructions on installation of the HD once you have lifted the glass.
Good luck.
Sam.

How to upgrade my Imac to OS X 10.7? These are the specs 1.83 GHz intel core duo

How to upgrade my Imac to OS X 10.7? These are the specs 1.83 GHz intel core duo.
I need the right version for my iMac 1.83 GHz intel Core Duo to go from 10.6.8 to 10.7. How do i find the correct version for my computer?

you computer is too old, it can not run 10.7., 10.6.8 is the limit.

What is the most effective way to get my imac 2 ghz intel core duo 2 10.4.11 to be able to run 10.5 and sync with my iphone 4s?

What is the most effective way to get my imac 2 ghz intel core duo 2 10.4.11 to be able to run 10.5 and sync with my iphone 4s?

As your Mac should run Snow Leopard provided it has at least 1GB memory, that would be a good deal easier and very much cheaper than trying to find a 10.5 install disc.
Snow Leopard costs $30 approx from the online Apple store (£26 if you're in UK)
You'll need to update Tiger to 10.4.11 with the combo installer first (unless you're just erasing the disc and starting fresh) You can then update SL from 10.6.3 to 10.6.8 with its combo installer.
For comparison, 10.5 Leopard is currently running about $130 from Apple (if still available) and more on Amazon etc.
This info for Leopard courtesy of TexasMacMan;
Mac OS X 10.5 Leopard installation system requirements
http://support.apple.com/kb/TA24950
Leopard is no longer available at the Apple Store but may be available by calling Apple Phone Sales @ 1-800-MY-APPLE (1-800-692-7753).
If you can't obtain a retail install DVD from Apple, look on eBay or Google the installer part numbers to possibly find at an on-line store. Here's what to look for:
MB427Z/A Leopard 10.5.1 install DVD
MB576Z/A Leopard 10.5.4 install DVD
MB021Z/A Leopard 10.5.6 install DVD (single user)
MB022Z/A Leopard 10.5.6 install DVD (5-user family pack)
Installing Mac OS X 10.5 Leopard
http://support.apple.com/kb/HT1544
Mac OS X 10.5 Leopard Installation and Setup Guide
http://manuals.info.apple.com/en/leopard_install-setup.pdf
After you install the base 10.5, download & install the 10.5.8 combo update at http://support.apple.com/downloads/Mac_OS_X_10_5_8_Combo_Update

IMac CPU3.06 GHz Intel Core 2 Duo, 8GB, Extremely slow and repeatedly "out of Memory" since migration from Mountain Lion to Mavericks

Dear Apple Support Community.
As mentioned by a number of users reporting the same problem, my 2009 iMac CPU3.06 GHz Intel Core 2 Duo, 8GB RAM, has become extremely slow and repeatedly "out of Memory" since it was migrated from Mountain Lion to Mavericks (OS 10.9 then OS 10.9.1).
I have already run CleanMyMac, deleted 5GB of useless stuffs, which did not translate into any improvement. Following the advices collected in other Apple Support Community threads, I have applied EtreCheck the outcome of which is provided below.
For information, I have also upgraded my 2011 MacBook CPU2.3 GHz Core i7, 8GB which became only a bit slower than before, sometimes freezing which it almost never did before. However, I am used to the fact that Mac get usually slower and more prompt fo freeze after upgrading to a more recent OS.
Both my 2009 iMac and my 2011 MacBook have F-Secure installed. So the problem with the 2009 IMac is unlikly to be due to the presence of F-Secure. Interestingly, the few abnormalities found by Etrecheck were exacly identical before I ran CleanMyMac. There are two more findings (mentioned below) since I ran CleanMyMac on the 2009 iMac, which again didn't improve the problem.
So please find below the details of the EtreCheck experience and some additional measurements made with iStat while running EtreCheck:
Hardware Information:
iMac (24-inch, Early 2009)
iMac - model: iMac9,1
1 3.06 GHz Intel Core 2 Duo CPU: 2 cores
8 GB RAM
Video Information:
ATI Radeon HD 4850 - VRAM: 512 MB
Audio Plug-ins:
BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
AirPlay: Version: 1.9 - SDK 10.9
AppleAVBAudio: Version: 2.0.0 - SDK 10.9
iSightAudio: Version: 7.7.3 - SDK 10.9
System Software:
OS X 10.9.1 (13B42) - Uptime: 0 days 2:40:57
Disk Information:
WDC WD1001FALS-40K1B0 disk0 : (1 TB)
EFI (disk0s1) <not mounted>: 209.7 MB
XooS5 HD (disk0s2) /: 999.35 GB (189.85 GB free)
Recovery HD (disk0s3) <not mounted>: 650 MB
OPTIARC DVD RW AD-5670S
USB Information:
Apple Inc. Built-in iSight
Canon CanoScan
Apple Computer, Inc. IR Receiver
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
FireWire Information:
WD My Passport 071D 800mbit - 800mbit max
EFI (disk1s1) <not mounted>: 209.7 MB
disk1s2 (disk1s2) <not mounted>: 2 TB
Boot OS X (disk1s3) <not mounted>: 134.2 MB
Thunderbolt Information:
Kernel Extensions:
com.f-secure.kext.fsauth          (1.0.0d1)
Problem System Launch Daemons:
[failed] com.apple.wdhelper.plist [REMARK: this abnormality appeared only after running CleanMyMac. It does not appear on my 2011 MacBook]
Problem System Launch Agents:
Launch Daemons:
[loaded] com.adobe.fpsaud.plist
[invalid] com.bjango.istatlocaldaemon.plist [REMARK: this abnormality pre-existed to running CleanMyMac. It appears also on my 2011 MacBook]
[loaded] com.f-secure.fsavd.dbhelper.plist
[loaded] com.f-secure.fsavd.plist
[loaded] com.f-secure.fsmac.firewall.plist
[loaded] com.f-secure.fsmac.fsupdated_guts2.plist
[loaded] com.f-secure.fsmac.licensetool.plist
[loaded] com.macpaw.CleanMyMac2.Agent.plist
Launch Agents:
[loaded] com.babylon.activation.plist
[loaded] com.bjango.istatlocal.plist
[loaded] com.f-secure.relauncher.plist
[loaded] com.f-secure.trasher.plist
User Launch Agents:
[loaded] com.adobe.ARM.[...].plist
[loaded] com.google.keystone.agent.plist
[loaded] com.macpaw.CleanMyMac2Helper.diskSpaceWatcher.plist
[loaded] com.macpaw.CleanMyMac2Helper.scheduledScan.plist
[loaded] com.macpaw.CleanMyMac2Helper.trashWatcher.plist
User Login Items:
iTunesHelper
Dropbox
F-Secure Anti-Virus for MAC
3rd Party Preference Panes:
Flash Player
Internet Plug-ins::
FlashPlayer-10.6: Version: 11.9.900.170 - SDK 10.6
Default Browser: Version: 537 - SDK 10.9
AdobePDFViewerNPAPI: Version: 11.0.04 - SDK 10.6
AdobePDFViewer: Version: 11.0.04 - SDK 10.6
DivXBrowserPlugin: Version: 2.1
Flash Player: Version: 11.9.900.170 - SDK 10.6
OfficeLiveBrowserPlugin: Version: 12.2.8
Google Earth Web Plug-in: Version: 6.1
QuickTime Plugin: Version: 7.7.3
iPhotoPhotocast: Version: 7.0
User Internet Plug-ins::
Picasa: Version: 1.0
Bad Fonts:
None
Old applications:
None
Time Machine:
Skip System Files: NO
Mobile backups: OFF
Auto backup: YES
Volumes being backed up:
XooS5 HD: Disk size: 930.71 GB Disk used: 753.90 GB
Destinations:
XooS5 TM [Local] (Last used)
Total size: 2
Total number of backups: 32
Oldest backup: 2013-09-15 01:11:39 +0000
Last backup: 2013-12-07 12:48:45 +0000
Size of backup disk: Too small. Backup size 2 < (Disk used 753.90 GB X 3)
Time Machine details may not be accurate. All volumes being backed up may not be listed.
REMARK: The above finding is unlikely to be accurate. In fact, my Time Machine is supported by a 2TB WD My Passport Studio external HD connected with a Firewire 800. As mentionned, only 754GB of the 2000GB are used.
Top Processes by CPU:
5%          backupd
5%          Mail
5%          WindowServer
3%          Finder
3%          Dropbox
Top Processes by Memory:
1.60 GB          mds_stores REMARK: this item was marked in red in the outcome of EtreCheck, so I assume there is something wrong there
82 MB          Finder
74 MB          Mail
49 MB          softwareupdated
49 MB          Dropbox
Virtual Memory Statistics:
97 MB          Free RAM
1.21 GB          Active RAM
1.19 GB          Inactive RAM
1.21 GB          Wired RAM
1.83 GB          Page-ins
36 MB          Page-outs
Please find now some additional measurements collected with iStat while running EtreCheck:
Practically:
The iMac can work slowly with only one software e.g. either Mail or Safari or Firefox, but still the below "out of Memory" message occurs about every 3 minutes.
Aperture has becomre to slow to be useable
If trying to write a mail (with Mail) while Safari or Firefox is open, then the "out of Memory" message occurs about every 20 seconds so I need to check on "Resume" several times per minute.
Conclusions
From the above, unless anyone in the Apple Support Community proves to be able to identify a specific problem leading to a way to find a cure, I tend to conclude that Mavericks is not suitable for computers operating with a Core 2 Duo CPU even with a 8GB of RAM.
Unless I missed something, I did not see any warning from Apple Computer Inc. informing their customers they should refrain from upgrading Core 2 Duo Computers.
The only solution I see so far is to downgrade from Mavericks to Mountain Lion. And the Apple Support Community would confirm that it is the only solution, I would appreciate to get your guidance on how to proceed.
Intended action plan
Migrate the above 2009 iMac to a 2014 Mac Mini Server operating on Mavericks to ensure that no data may be lost while downgrading to Montain Lion.
Provided the above downgrading operation is successful, assign this 2009 iMac to partial retirement e.g. Mail, Skype, iTunes and DVD player.
In advance, I would like to thank the Apple Community for helping me either i) finding a cure to the problem, ii) or confirming that Mavericks cannot operate properly on Core 2 Duo computers, iii) and in such a case, guiding me on how to downgrade to Mountain Lion.
Yours sincerely
Core

... what anti-virus would you recommend using?
Use what is already included with OS X. It already includes everything it needs to protect itself from viruses and malware. Keep it that way with software updates from Apple.
A much better question is "how should I protect my Mac":
Never install any product that claims to "speed up", "clean up", "optimize", or "accelerate" your Mac. Without exception, they will do the opposite.
Never install pirated or "cracked" software, software obtained from dubious websites, or other questionable sources. Illegally obtained software is almost certain to contain malware.
Don’t supply your password in response to a popup window requesting it, unless you know what it is and the reason your credentials are required.
Don’t open email attachments from email addresses that you do not recognize, or click links contained in an email:
Most of these are scams that direct you to fraudulent sites that attempt to convince you to disclose personal information.
Such "phishing" attempts are the 21st century equivalent of a social exploit that has existed since the dawn of civilization. Don’t fall for it.
Apple will never ask you to reveal personal information in an email. If you receive an unexpected email from Apple saying your account will be closed unless you take immediate action, just ignore it. If your iTunes or App Store account becomes disabled for valid reasons, you will know when you try to buy something or log in to this support site, and are unable to.
Don’t install browser extensions unless you understand their purpose. Go to the Safari menu > Preferences > Extensions. If you see any extensions that you do not recognize or understand, simply click the Uninstall button and they will be gone.
Don’t install Java unless you are certain that you need it:
Java, a non-Apple product, is a potential vector for malware. If you are required to use Java, be mindful of that possibility.
Disable Java in Safari > Preferences > Security.
Despite its name JavaScript is unrelated to Java. No malware can infect your Mac through JavaScript. It’s OK to leave it enabled.
Block browser popups: Safari menu > Preferences > Security > and check "Block popup windows":
Popup windows are useful and required for some websites, but popups have devolved to become a common means to deliver targeted advertising that you probably do not want.
Popups themselves cannot infect your Mac, but many contain resource-hungry code that will slow down Internet browsing.
If you ever see a popup indicating it detected registry errors, that your Mac is infected with some ick, or that you won some prize, it is 100% fraudulent. Ignore it.
Ignore hyperventilating popular media outlets that thrive by promoting fear and discord with entertainment products arrogantly presented as "news". Learn what real threats actually exist and how to arm yourself against them:
The most serious threat to your data security is phishing. To date, most of these attempts have been pathetic and are easily recognized, but that is likely to change in the future as criminals become more clever.
OS X viruses do not exist, but intentionally malicious or poorly written code, created by either nefarious or inept individuals, is nothing new.
Never install something without first knowing what it is, what it does, how it works, and how to get rid of it when you don’t want it any more.
If you elect to use "anti-virus" software, familiarize yourself with its limitations and potential to cause adverse effects, and apply the principle immediately preceding this one.
Most such utilities will only slow down and destabilize your Mac while they look for viruses that do not exist, conveying no benefit whatsoever - other than to make you "feel good" about security, when you should actually be exercising sound judgment, derived from accurate knowledge, based on verifiable facts.
Do install updates from Apple as they become available. No one knows more about Macs and how to protect them than the company that builds them.
Summary: Use common sense and caution when you use your Mac, just like you would in any social context. There is no product, utility, or magic talisman that can protect you from all the evils of mankind.

Late 2006, 24" iMac, 2.16 GHz Intel Core 2 Duo, Screen Tearing, nVidia 7300

Late 2006, 24" iMac, 2.16 GHz Intel Core 2 Duo, Screen Tearing, nVidia GeForce 7300 GT
I've been suffering with screen tearing, strange screen artifacts, etc. followed by totally unresponsive freezing machine. This problem has been happening to varying degrees for about 9 months.
Initially, I was able to mitigate the problem with smcFanControl. Adjusting the fan speeds up helped keep the machine cool and prevent most of the problems. Recently, we had a spell of hot weather and the fans just couldn't keep up. If you're using smcFanControl, the only fan speed that will really make a difference is the CPU. The HDD and ODD fans are no where near where you need to be.
Also, I noticed the machine was LOADED with dust when I took it apart, including the heat sink fins for the graphics card. If you have time you may want to try a thorough cleaning with compressed air before replacing the card. You just need to get through step 11 below to access what needs to be cleaned.
Based on reading here and elsewhere, I decided to replace the graphics card. To give back to the community, I wanted to layout the procedure here.
Where to buy the card.
I had a tough time finding the right card. I did exhaustive web searches using every combination of Nvidia 7300 GT, etc. You really need to search by the Apple part number. The Apple part number for the 7300 is 661-4179, for the 7600 is 661-4180. I found it at We Love Macs and at dv warehouse. I paid $248 for the 7600 card. BE CAREFUL buying a "refurbished" card. At We Love Macs, "refurbished" means "pulled from a working machine." Could be a machine with as much mileage as yours and prone to the same failures as yours.
The card is an MXM style card (generally used in laptops), with a giant heat sink and heat pipe assembly. The card can be separated from the heat assembly. If I had time, I would have tried a generic, cheaper, MXM style card.
Dispelling some myths.
People here and elsewhere have said that no Intel iMac graphics card can be replaced, that they're wedded to the logic board. The one on this model can be replaced, I've done it. Also, some have said you can't put a 256MB, 7600 GT in a machine that originally had a 128MB, 7300 GT. Also, not true. That's what I did to my machine and it is working fine.
So here's the step-by-step on my take apart and replacement. This is just one user helping out others, PROCEED AT YOUR OWN RISK. This takes about 1 1/2 hours to take apart and 2 to put back together.
1) Install the iStat widget and monitor the temperatures for a few days and record the temperatures (to be able to verify that you've completed the repair correctly later)
2) Make a complete backup of any internal drives and make sure the backup will be bootable (use Carbon Copy Cloner)
3) Use static safeguards, like an anti-static wrist strap.
4) Get a pen a stack of paper envelopes to separate and label the pieces you remove.
5) You'll need a #2 Phillips and #6, 8, 10 Torx. Most of the screws at T-8. There are 8 T-8s holding in the LCD. They are about 1 1/4" down. You'll need a long, skinny T-8 to get to them.
6) Unplug the machine and place it on it's back on a large white sheet of paper.
7) Remove RAM door, #2 Phillips x 2.
8) Remove RAM.
9) Remove 4 T-8s along bottom.
10) Remove large rectangular plastic bezel surrounding the whole machine, tilt up being careful not to stress iSight cables. You'll need to stretch it around the RAM ejection tabs.
11) Detach two iSight cables.
12) Peel up black stickers at lower corners of speakers.
13) Remove LCD screws, T-8 x 8. You'll probably drop a few, they're pretty easy to retrieve.
14) Remove two retaining screws on right hand LCD cable. T-6 x2 Unplug cable.
15) Remove LCD inverter cable, left.
Start unplugging everything connected to the logic board.
16) Unplug cable coming from right speaker. Note cable routing, it is the only one that's a little tricky. Also, note that the left one plugs in on the right and the right one plugs in on the left.
17) Remove right speaker. T-10 Note: left and right speaker screws are different lengths.
18) Unplug ODD blower cable.
19) Unplug ODD temp cable and lift up tape.
20) Unplug HDD blower cable.
21) Unplug the HDD temp cable.
22) Unplug the camera & mic cable.
23) Unscrew the clamp securing the airport card (has two antenna cables going to it, labeled PCIE), T-6 x 2
24) Unplug SATA cable.
25) Unplug Power cable, thick black plastic harness, socket.
26) Unplug ambient temp cable.
27) Unscrew the bluetooth card, T-6 x2.
28) Unplug CPU blower cable.
29) Unplug power button cable, 2 conductor, tiny cable, bottom left.
30) Unscrew left speaker, T-10, unplug from logic board, but just leave dangling, no need to remove cable completely.
31) Remove logic board screws. Be careful to segregate them, they have different lengths and different thread pitches and thread types. Some are machine threads going into metal, some are coarse threads going into plastic.
31a) Heat sink frame to case T-8 x 2
31b) Logic board to case T-8 x 3
31c) Screws at heat sink from arrows T-8 x 3
31d) Logic board at bottom near RAM slot T-8 x 2
32) Unplug ODD ribbon cable, be extremely careful. Release plastic tabs on each side to remove. Be sure it is fully and evenly seated when you put it back later.
33) Remove logic board with attached graphics card.
34) Unplug graphics card heat sink sensor cable at logic board end.
35) Remove graphics card screws 2 x T-6
36) Remove single screw from small L-bracket on heat sink 1 x T-6
Replace graphics card.
Reverse steps, put everything back together. Be careful not to pinch any cables when you put the logic board back in. When you put the LCD back in, if you can't get the screws to stick to the driver, use some glue stick from your kid's art supplies.
Test everything. You've disconnected every cable in the system.
I torture tested the machine with a space heater on it, 5 different videos of different formats playing at the same time. No problems.
I took a lot of pictures inside the machine. As soon as I figure out a good place to post them, I'll try to add a link here.
Good luck

Greetings!
I know this is in response to your post from over 2 years ago, but I was searching on Apple's site for the max RAM I can upgrade our refurbed iMac too and it brought up this post.
Oddly enough, I've been experiencing the same screen issues and locking up on our iMac as well. I was concerned it was a bad memory module, but now I'm thinking it's the same issue you found.
Because I bought this some 2+ years ago refurbed from Apple, I'm not surprised that could be the actual problem.
I've pulled this thing apart once to replace the hard-drive which crashed about a year ago, so I'm not totally new at opening it up, but this process you mention sounds pretty intense...just wanted to get your second take on it based on what I've done thus far.
Thanks again for posting this...it was an eye-opener as to what might actually be causing our issues with our trusted Mac!
Joshua

IMac 3.06 GHz Intel Core 2 Duo with 12gb of RAM running very very slow.

My late 2010 iMac 3.06 GHz Intel Core 2 Duo with 12gb of ram is running very slow. It takes a very long for the computer to boot with the desktop taking ages to fully load. Applications are also taking an unholy amount of time to load with the spinning wheel always appearing through out use, and they often crash or don't respond and close during use. I'm talking applications like Word taking 3 minutes to load and getting the spinning wheel when font size is tried to be changed and crashing and closing if a large volume of text is attempted to be pasted into a document.The computer is also failing to shut down properly just staying on a blue screen. I recently wiped and completed a fresh install however the issues came back.
As you can imagine after spending so much on the computer I'm not best pleased about these issue, I've spoken to the apple staff in my local store by they weren't very helpful and seemed to no little about computers and the so called "Genius" who I spoke to about my issue was a joke, repeating himself and talking utter rubbish, while I understand you need to look at a computer to get a real picture of an issue, some advice could of been provided. I haven't got time to take the computer to the store at the moment and get a technician to look a it, so I was wondering if anyone else had experienced these issues and knew what caused the fault, and that way if possible I can repair the issue myself.
Thanks in advance for any help on the issue it’s much appreciated. At the moment I'm pretty close to ditching the thing and buying an Alienware!

See:
Mac Maintenance Quick Assist,
Mac OS X speed FAQ,
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