27" iMac w/ Radeon 4850 total graphics corruption

I have a Late 2009 iMac 27" Core i5 with Radeon HD 4850 GPU running 10.6.8. I came home the other day to find it only showed a black screen after waking from sleep. After a reboot, it displayed multi-colored vertical stripes immediately after power on, followed by a white screen, then a werid multi-color pattern near the end of the boot process. Further reboots show the same. After it boots fully, I can ssh into it. I can also use remote screen sharing and VNC, although they only show the same weird patterns, so I still can't use the GUI. I reset the SMC and PRAM, I tried booting in safe mode, and I tried booting the install and AHT discs that came with it, but none of that made any difference.
http://imageshack.us/a/img694/1940/imac1j.jpg - after power on
http://imageshack.us/a/img641/497/imac2e.jpg - after finished booting
http://imageshack.us/a/img846/966/imacremote.png - detail of weird pattern, via remote screen sharing
I suspect the GPU is fried. Can anyone confirm that?
I've never noticed a heat problem before. What would cause this?
Is there a way I can re-flash the graphics firmware?
And finally (wishful thinking) is this a known problem that Apple will fix for free?
thanks

Likely mndelo 1 is correct, but to dd...
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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Installing Windows 7 on 2009 iMac with Radeon 4850 graphics (Guide)

Howdy
(This was originally posted in the iMac forum by me as a reply to a Windows 7 question, but I figured it may be useful here too. This may be adjustable to work on other 2009 series macs, but I make no promises. If anyone has any tips on how to get the things working that I mentioned as not, feel free to reply. I would love keyboard volume control specifically :p)
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Early 2009 iMac
3.06 GHz
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Radeon 4850
How to get video to work:
1) Download latest "desktop" video drivers from ATI's site (I used catalyst 9.7)
32 bit: http://game.amd.com/us-en/drivers_catalyst.aspx?p=win7/windows-7-32bit
64 bit: http://game.amd.com/us-en/drivers_catalyst.aspx?p=win7/windows-7-64bit
2) Run MobilityModder from the following link: http://www.driverheaven.net/modtool.php
3) Follow the directions on the page (When it sais Vista only, that means Win7 too)
How to get audio to work:
1) Download exe installer from the following page: http://www.realtek.com.tw/downloads/downloadsCheck.aspx?Langid=1&PNid=24&PFid=24 &Level=4&Conn=3&DownTypeID=3&GetDown=false
2) Run the installer
Things that do work
Video (Built in version isn't the best, follow directions above)
Audio (Built in version doesn't work, follow directions above)
Wireless Internet (Built in)
Wired Internet (Built in)
Bluetooth (mouse and keyboard) (Built in)
Things that I haven't figured out
1) How to get the 64bit apple software frontend to install (the taskbar icon)
2) How to get volume keys to work (the apple keyboard driver actually is worse than default)
3) Things like changing brightness (but I would assume this would go with getting the apple frontend software to work)
Comments
1) It is blazing fast
2) While this works on 64bit, I don't think 32bit would be much different to setup
3) Using the latest ATI drivers are important because they support the new Windows 7 driver model (WDDM 1.1). While older versions may work (like bootcamp 2.1), they won't be the most advanced or fastest performing.
4) While I haven't been able to install the bootcamp software (Win7 warns that it is incompatible), from what I've read (all the posts about DPC latency), it is probably better off for performance
5) Your mileage may vary, I haven't tested this on anything other than my 24" radeon 4850 iMac. I also haven't tested it on 32bit, so don't blame me if something doesn't work right. Basically, if you break something it isn't my fault
6) Bluetooth pairing is somewhat quirky, it usually goes pretty quickly for the mouse. Sometimes it will take multiple tries (canceling out, and starting again, etc) especially for the keyboard. Once everything is paired though it works perfect without any extra drivers.
7) Remember this isn't supported by Apple yet.

Hi Beta_,
If you are looking for assistance in setting up Windows 7 in Bootcamp on your iMac running Mavericks, you may find the following articles helpful:
Mac Basics: Using Windows on your Mac via Boot Camp
http://support.apple.com/kb/ht1461
OS X Mavericks: Use Windows 7 or Windows 8 on your Mac
http://support.apple.com/kb/PH14129
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Hi Cathy and welcome to Discussions,
sounds to me as if you are missing the Catalyst Control Center, which usually provides these kinds of setting.
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HI Dave,
*"clicked the power button, and it went to sleep/ standby as usual. Today I clicked the power button, the space bar, the mouse, and no response."*
First, try resetting the SMC, instructions here. http://support.apple.com/kb/HT1543
If the game disk is still in the optical drive, *try booting while holding down the mouse*.
Next, try booting from your install disk.
Insert Installer disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu (Panther and earlier) or Utilities menu (Tiger and later) and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
(Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
According to this article there might be a fix in the making. http://techblips.dailyradar.com/story/newimac_owners_see_radeon_hd_4850_related_lockup/
I did a quick search in this iMac forum for ATI Radeon HD 4850 and you are not alone.
http://discussions.apple.com/search.jspa?objID=f1110&search=Go&q=ATIRadeo+hd4850
"Does anyone think this could possibly be fixed at the apple store? A" It wouldn't hurt to have them look at it. You can make an appointment at the Genius Bar in advance. http://www.apple.com/retail/geniusbar/
Carolyn

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BOILERPLATE TEXT:
If you give complete and detailed information about your setup and the issue at hand, such as your platform (Mac or Win), exact versions of your OS, of Photoshop and of Bridge, machine specs, such as total installed RAM, scratch file HDs, video card specs, what troubleshooting steps you have taken so far, what error message(s) you receive, if having issues opening raw files also the exact camera make and model that generated them, etc., someone may be able to help you.
A screen shot could be very helpful too.
Please read this FAQ for advice on how to ask your questions correctly for quicker and better answers:
http://forums.adobe.com/thread/419981?tstart=0
Thanks!

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This procedure is a diagnostic test. It makes no changes to your data.
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[SOLVED] Graphic Corruption with 3D and Wine 1.3.8 + Catalyst 10.11

Hello!
I'm getting graphic corruption with 3D games on my Arch Linux configuration using Wine and Catalyst. Tried World of Warcraft (also with opengl rendering) and Guild Wars - graphics look stretched and teared.
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Last edited by CHPE (2011-01-02 17:37:11)

I get same problem with guildwars in fullscreen when entering character select. I have to ctrl-alt-F1 to tty then back to get rid of the garbled graphics. Then my characters vanishes except for their armor/effects. Going into windowed mode stops the garbling of the graphics but the bodyless avatars remain. There is one error stands out in wine output but can't find anything specific to this error that helps.
fixme:actctx:parse_depend_manifests Could not find dependent assembly L"Microsoft.Windows.Common-Controls" (6.0.0.0)
Infos
2.6.36-ARCH X86_64
ATI Radeon 5870
catalyst-hook 10.11-1
catalyst-utils 10.11-1
lib32-catalyst-utils
xorg 1.9.2
wine 1.3.9 (same problem with previous versions of wine)
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Last edited by Snakeye (2010-12-13 03:03:49)

27" iMac w/ Radeon 4850 total graphics corruption

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