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music_man
21-01-2008, 05:33 PM
Hi,

On my iMac - a newish one with a 256Mb graphics card and all stainless steel, when I play games in windows, after a while the screen goes weird colours like it's 256 colours.

Any ideas why this is?

Cheers

plod
21-01-2008, 05:40 PM
Have you got the latest video card drivers?
What version of windows are you using? i presume you are running windows through boot camp and not Vmware or parallels

sal
21-01-2008, 06:29 PM
Yeah, you'd have to do it through Boot Camp as support for hardware accelerated 3D graphics in virtualised software solutions like Parallels and VMware Fusion is pretty flaky if existent at all.

music_man
21-01-2008, 06:47 PM
I am using bootcamp and have the latest drivers...

music_man
09-05-2008, 10:23 PM
I installed the latest drivers from the ATI site but still it goes funny after a while.

Agent_24
09-05-2008, 11:58 PM
maybe there is a hardware fault or overheating or something. it is apple after all..

music_man
10-05-2008, 12:07 AM
Hi Agent 24, thanks for your reply.

Strangely enough it works fine in OS X

vitalstatistix
10-05-2008, 07:01 AM
The latest version of VMware is actually looking pretty good for gaming.

music_man
10-05-2008, 10:25 AM
Great.

Any ideas about the graphics error?

vitalstatistix
10-05-2008, 01:40 PM
Great.

Any ideas about the graphics error?

None from personal experience. My suggestion would be to take it into your nearest Apple store, plod is the only one on the forum with the new aluminum iMac, I have the earlier white model. You say the game is fine on the Mac side but a problem on the Windows side - without wanting to state the obvious but that sounds like a Windows driver issue.

music_man
10-05-2008, 02:25 PM
I don't play games on my Mac (what can I play...), but only on my Windows partition. Yeah it might be a driver issue, but I have windows fully updated (including sp3) and the latest drivers from ATI.

Plod sent me a message, so I'll check out his suggestion.

Cheers.

vitalstatistix
10-05-2008, 04:15 PM
There are more games for the Mac than you might realise http://www.apple.com/games/
but I would stick with playing them on Windows via Bootcamp and go with plod's link. The Mac Pro has actually just received a Nvidia 8800 card update which is apparently ideal for gaming although I am not sure if you can put that in an iMac.

music_man
29-06-2008, 12:24 PM
It is a weird one. I installed the ATI catalyst control center and sometimes I can play games for ages without it going funny. So maybe it is a heating issue.

vitalstatistix
29-06-2008, 01:15 PM
I wouldn't be surprised if it was an over heating issue as I have seen many comments posted by gammers using the latest iMac suffering from the same issues.

Agent_24
29-06-2008, 01:30 PM
Do you have all the latest drivers for everything? not just video? make sure all your device drivers are latest versions.

I used to get a similar problem when running webshots desktop. every time it automatically changed the wallpaper, some games would turn funny colours if I was playing them at the time.

do you have any kind of program running in background?

music_man
29-06-2008, 01:48 PM
Hi,

I'm not sure what else to update...

My iMac seems to be running at 41 degrees using Speedfan.

vitalstatistix
29-06-2008, 01:54 PM
That would be pretty normal. I know that some of the iMacs have been having issues with the monitors which may be what you are experiencing. You could always take it into an Apple store and check with them. I haven't had any issues with mine but it is the last of the white iMacs.

music_man
29-06-2008, 01:55 PM
Everything in OS X works fine, so I doubt very much the Apple store will care about the windows partition.

vitalstatistix
29-06-2008, 01:56 PM
Ah you are probably correct there. I take it you are just using Windows for games?

Agent_24
29-06-2008, 01:57 PM
41 degrees is likely just your CPU. as far as I know speedfan doesn't check the temperature of the video card.

To check that, download this: http://www.techpowerup.com/gpuz/
If you've got a sensor on your GPU this will show it.

Drivers? well make sure you have newest chipset drivers installed for a start. You could check audio, lan too but they probably wouldn't cause this.

What about directX? that might cause problems if it's not the latest

music_man
29-06-2008, 01:59 PM
Yeah I use windows for my games. I've got the latest bootcamp version...

I downloaded that program. What am I looking for?

Where would I find my chipset drivers?

vitalstatistix
29-06-2008, 02:03 PM
Google and Apple support forums like this one
http://discussions.apple.com/message.jspa?messageID=2929487
Google would be your best bet.

music_man
29-06-2008, 02:05 PM
Thanks for that. Do I use a program like Everest to get my chipset number?

Agent_24
29-06-2008, 02:06 PM
I downloaded that program. What am I looking for?

Click on the sensors tab, there it should show you the info.

music_man
29-06-2008, 02:07 PM
It says:

GPU Core Clock 594.0 MHz
GPU Memory Clock 648.0 MHz

Agent_24
29-06-2008, 02:07 PM
Yes everest should tell you, so should this: http://www.cpuid.com/download/cpuz_146.zip

Agent_24
29-06-2008, 02:10 PM
It says:

GPU Core Clock 594.0 MHz
GPU Memory Clock 648.0 MHz

Ahh, either you have no temp sensor on your video card or gpu-z cannot read it... if you do have everest, that might detect it

music_man
06-07-2008, 02:24 PM
I discovered that the harddrive heats up while in Windows and when it reaches about 44 things go funny.

Could it be I need the right fan drivers?

vitalstatistix
06-07-2008, 02:30 PM
That would sound like you are lacking the Windows drivers for the fans

music_man
06-07-2008, 02:41 PM
This guy wrote a big post:

http://forums.macrumors.com/showthread.php?t=372049

For Vista but had no reply.

vitalstatistix
06-07-2008, 03:48 PM
Interesting to not that that post is nearly a year old> Have you tried looking for Bootcamp updates as I know that Apple has updated the bootcamp firmware since October last year.

Have you posted your problem on MacFixitforums or Apple support forums?

I did a slightly different search and came up with this link
http://forums.macnn.com/104/alternative-operating-systems/338236/solution-install-update-windows-ati-graphics/
As well as this list
http://www.google.co.nz/search?q=Graphics+windows+drivers+fans+on+OS+X&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-GB:official&client=firefox-a

music_man
06-07-2008, 04:18 PM
It's all updated and I have catalyst. I've spent a while trying to fix this problem by reading forum posts and searching google. Looks like I should just uninstall windows an buy a separate PC.

sal
06-07-2008, 04:25 PM
Was this Vista or XP?

vitalstatistix
06-07-2008, 04:40 PM
It's all updated and I have catalyst. I've spent a while trying to fix this problem by reading forum posts and searching google. Looks like I should just uninstall windows an buy a separate PC.

If it is just for gaming that might be a better idea to save you the hassels of trying to sort it out.

music_man
23-11-2008, 12:21 AM
It's both for xp and Vista. I'm pretty sure it is nothing to do with the ATI drivers or the temperature of the computer as I've updated graphics and monitored CPU temperature (but not graphics card temperature).

Apparently Apple had to release a fix for OS X with this graphics card: Ati Mobility Radeon HD 2600 XT.

Agent_24
23-11-2008, 11:33 AM
How do you know it's not temperature if you don't even know what temperature the card is running at?

Do you even know what the "fix" does?

music_man
23-11-2008, 12:27 PM
Thanks for your reply, Agent_24. The fix for OS X was to stop the graphics card freezing. I'm not sure if the graphics card temperature is involved and whether or not I can measure the temperature with my chip. The graphics problem mainly happens when I do graphics-intensive things such as games and I am wondering if there is a fan driver missing.

Agent_24
23-11-2008, 02:41 PM
The fans (if you're talking about video card) are controlled primarily by the video card's BIOS

They can be controlled secondarily by software but if none is present then the BIOS settings will take over.

It's possible that the fix apple published overrides the BIOS fan settings and runs them faster, maybe even underclocks the card to keep heat down.

To test this theory you'd need to measure the Temperature, fan speed and core/memory speeds with and without the patched OSX loaded, to see if there was any difference.

Could be a bugged BIOS on the card or a bad cooling design, but probably unlikely to be the drivers...