Screen graphics drawing corruption on iMac 11,1 Intel Core i7 2.8 GHz running OSX 10.6.8

iMac 11,1 Intel Core i7 2.8 GHz running OSX 10.6.8 with ATI Radeon HD 4850 display hardware has screen graphics drawing corruption. - some bizarre effects like a surround on two sides of main Firefox window with elements captured from the top and side of main screen. Toolbar buttons that walk off their positions when resizing a window? Mouse focal point offset in Firefox. Fuzzy sceen draws in Safari

Hello,
Have you blown the dust out lately?
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
iStat Menus...
http://bjango.com/mac/istatmenus/
And/or iStat Pro...
http://www.islayer.com/apps/istatpro/
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or some USB or Firewire device, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.
Check the System Preferences>Other Row, for 3rd party Pref Panes.

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Here is a link to the OS X Mountain Lion requirements.
http://www.apple.com/osx/specs/

How much Memory Should my IMac have? iMac, 24-inch, Intel Core 2 Duo

Hi, I have a problem. I have a iMac, 24-inch, Intel Core 2 Duo which had to have a hard drive replaced. Brought it home today and it is not the same? It makes weird noises when processing info and it seems to run slower. I noticed that the memory is only 1GB and this model should have 2 or something along those lines? It seems as though they didn't replace this with what I had on my original one? Can anyone help me, let me know how to verify that I am lacking what I had on this machine when I bought it and what should this model have on it? I am so ****** off right now, it isn't funny!
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What imac do you have how old is it. The 2.4ghz 20inch model still comes with 1gb as standard in the uk anyway. most intel imac including mine are totally silent, is it overheating download a great widget called istat pro at http://www.apple.com/downloads/dashboard/status/istatpro.html this will show you your fan and temp etc. If it in warranty then take it back to apple or phone them with the machine serial number and they will inform you to what spec the imac was shipped to you. The desktop image problem - go-to system preferences then to desktop and screen saver you will find all your iphoto folder and events in the right hand side just click on your image this should work.

IMac (3.4gHz Intel Core i7) shuts down when sleeps, then won't restart

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Cheers,
Kristin

Hey kristinandmike,
I had a similar problem shortly after I bought my 27" iMac. Here is an excerpt from my discussion:
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And I do not see any specifications for a White iMac with a 24" screen that is 2.33GHz.
But now I found it...
http://support.apple.com/kb/SP28
You have what normally would have been a 2.16GHz model but with the made to order 2.33GHz upgrade. Memory is...
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Many older systems can support more ram than their official specs due to larger RAMs being released after the support for testing new RAM was done. Apple specifically limiting you to a single 2GB RAM with the other having to be 1GB would seem to indicate there IS an issue with supporting a pair of 2GB rams.
So you can very safely go from 2GB to 3GB by replacing one of the 1Gig modules with a 2GB module. However I can't say for sure if it would work to go to 4GB or not.
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mini-DisplayPort.
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See if you can get the drive to mount. See mount section of 1st link.
Disk Unmount Using Terminal
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Your Mac is definitely one of the supported models? http://www.apple.com/uk/osx/specs/
If so, what happens when you try to download? Is it a case of nothing happens? If so, take a look at the suggestions under 'Stalled Download' in this link:
http://www.wired.com/gadgetlab/2013/10/mavericks-issues-and-fixes/#slideid-23477 1
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I'm currently running OS-10.6.8 on my IMAC with an Intel Core 2 duo and would like to update to at lease 10.7. Can this be done and if so how?

Only if you cannot upgrade to Mavericks.
Upgrading from Snow Leopard to Lion or Mavericks
To upgrade to Mavericks you must have Snow Leopard 10.6.8, Lion, or Mountain Lion installed. Purchase and download Mavericks (Free) from the App Store. Sign in using your Apple ID. The file is quite large, over 5 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
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         1. iMac (Mid 2007 or newer) — Model Identifier 7,1 or later
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         4. MacBook Air (Late 2008 or newer) — Model Identifier 2,1 or later
         5. Mac mini (Early 2009 or newer) — Model Identifier 3,1 or later
         6. Mac Pro (Early 2008 or newer) — Model Identifier 3,1 or later
         7. Xserve (Early 2009) — Model Identifier 3,1 or later
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Are my applications compatible?
         See App Compatibility Table — RoaringApps.
Upgrading to Lion
If your computer does not meet the requirements to install Mavericks, it may still meet the requirements to install Lion.
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Hi,
Crucial's memory selector tells me that I can install a maximum of 4GB of memory on my iMac 3.06GHz Intel Core 2 Duo (24-inch). Why does the system info show me that I have 4 slots with 2 being empty (see picture below) ?
Regards.

Hi,
I found the reason why System Info is displaying 4 slots ... it's because I have 4 slots.
I have a 21,5" monitor not a 24". It is identified as an iMac10,1 model and the good news is that I can upgrade to 16Gb of memory.
That being said, I would like to upgrade, because I often find that my computer is slow. If I go to the Activity Monitor utility, iI think that my memory requires an upgrade but how much more should I put in ? See the memory display below.
Also can someone tell me if I could experience a faster computer if my processor is not used intensively, like shown below.
Regards.
!http://gallery.me.com/robertlesperance/100224/Memory/web.jpg?ver=12962321970001 !
!http://gallery.me.com/robertlesperance/100224/Processor/web.jpg?ver=12962321960 001!

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Hello I have a 24-inch iMac 2.16GHz Intel Core 2 Duo with OS X Leopard 10.5.8. Is the Mac I kompaktibel with the new OS X Lion Mountain? Thanks for the answer. E.Monti

Hi,
This is the compatibility list
http://www.apple.com/osx/specs/
if your iMac is mid2007 or newer - yes.
You will need to upgrade to 10.6 (Snow Leopard) first buy DVD from online apple store
Then to 10.7 Lion - buy and download via Store App included in SL
and then 10.8 Mountain Lion upgrade the same steps as Lion

Apart from backing up all docs, music, movies and pics, what else do I have to do before upgrading my 2007 24"iMac with 2.33 Core Duo/2 GB SDRAM and OSX 10.4.11 to Snow Leopard10.6.3? from

Apart from backing up all docs, music, movies and pics, what else do I have to do before upgrading my 2007 24"iMac with 2.33 Core Duo/2 GB SDRAM and OSX 10.4.11 to Snow Leopard10.6.3? from

In addition to the other suggestions, see:
http://www.macmaps.com/upgradefaq.html
http://www.macmaps.com/backup.html
http://www.thexlab.com/faqs/installswupdates.html
http://www.thexlab.com/faqs/backuprecovery.html

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Welcome to Apple Support Communities
Of course you can upgrade RAM. You have a Late 2006 iMac, which supports 4 GB of RAM. You can buy more memory at OWC or Crucial > http://eshop.macsales.com/shop/apple/memory/iMac/Intel_Core_2_Duo_2006
This Mac can't be upgraded to OS X Mountain Lion because OS X Mountain Lion needs a Mid 2007 or newer iMac. Instead, you can upgrade to OS X Lion by calling Apple > http://support.apple.com/kb/HE57 Make a backup of your files with Time Machine and check that your applications are compatible > http://www.roaringapps.com

IMAC early 2009 2GB RAM, 2.66ghz Intel Core 2 Duo, Im currently running Snow LEopard 10.6

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Mavericks is no longer available from the App Store, so your choice is Yosemite. One option is to create a new partition (~30- 50 GB), install the new OS, and ‘test drive’ it. If you like/don’t like it it, you can then remove the partition. Do a backup before you do anything. By doing this, if you don’t like it you won't have to go though the revert process.
Check to make sure your applications are compatible.
Application Compatibility
Applications Compatibility (2)

10.10 painfully slow on 2008 iMac 2.4gHz intel core 2 duo

I made a big mistake-
My gf sees me as the guy who really knows Macs.
I updated her 20" iMac 2.4gHz intel core 2 duo (3G ram) when the prompt came up in software updates.
Now she's practicing patience as everything is much slower and problematic in keeping connected to the ISP.
Accepting that the Mac has to re-index everything, we've allowed 3 days for this, but not much improvement.
The question:
What is Best Practices (and detailed method) for getting back to her previous OS without the install disk?
This is probably best until we can get a new Mac on her desk.
Is it better to stay with 10.10.1 - if so, we need to speed this puppy up.
Any help?
Message was edited by: Joe805

The first problem may arise from the fact that iMacs use 3.5" harddisk whereas most SSDs are 2.5" ones.
So some sort of tray or 'holder' is needed.
Second problem might be the thermal sensor Apple uses in some iMacs.
Your first recommendation to your friend: 'get a bigger harddisk and more RAM' sounds like the best way.
Stefan

Screen graphics drawing corruption on iMac 11,1 Intel Core i7 2.8 GHz running OSX 10.6.8

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