Question about freeze and ATI Radeon HD 2400 XT

Hi,
I have an aluminum 20-inch iMac 7.1 OSX 2.0Ghz intel Core 2Duo, mid 2007 running SL 10.6.8.
Some months ago it started having a random freeze problem that happened sporadically and then increased to happen from around 20min in 20min.
-mouse moves but nothing happens and I have to shut it down on power button.
After extensive troubleshooting not working I took it to repair, they tested my hardware and said it was perfect so at the end I did a clean install,ran repair permissions and brought my documents from my back up without using time machine nor migration assistant and installed all my apps from scratch.
It got much better, and first I thought it was a problem with Little Snitch app so I uninstalled it.
Also I had noticed that while using latest versions of Firefox the graphic display would have a strange glitch, such as brief instances of pixel artifacts that can also appear on my display when out of the browser.
- I turned off hardware acceleration on the browser's preferences and it seemed to disappear.
Although this freeze is still happening, specially when I wake up the mac from sleep and yesterday I got a black screen.
I think I may have a problem related to my ATI Radeon HD 2400 XT and I would like to ask if anyone here has a similar problem or if anyone knows about a fix .
I tried to update the ATi from apple’s site but the update’s installer said I don’t need the update.

Hi
@dmaude and George, thank you both I am glad there are more people now coming forward with this problem.
George, I believe you are right, I came to that conclusion several months ago, it is a problem with the GPU and my ATI RadeonHD 2400 and something wrong with the driver, maybe a kernel extension.
And I came to that conclusion when I noticed that if I turned off Firefox "hardware accelaration" the browsers prefs would not freeze but it happens with,e.g. Photoshop, when I use tools that pull from the GPU.
I am going to read the link you left here.thanks
dmaude: I installed Techtools and Diskwarrior, and now ran it periodically after my radical clean install where I brought all my files manually without using time machine nor migration assistant and installed all my apps from scratch.
I am a web artist thus I am not even using much of my 250GB, I have 200GB free and 3GB memory.
No bad blocks, no problems with fans nor temperature, I download all updates, absolutely nothing.
It is a virtual freeze and I am almost sure it started with snow leopard 10.6.3 update.
What I did though that seems to alleviate the problem was to install this tiny program/app called "caffeine" that stops my imac from entering sleep and so I still get the freeze but it happens less times. I leave here the link, maybe it helps you because I got so tired of this problem that I did not even want to upgrade to Lion.
http://lightheadsw.com/caffeine/
I filed many bug reports to Apple, no response. I found a link from 2007 related to something similar and where Apple finally confirmed it was their bug, as stated there:
"Apple technical support has already confirmed the issue with several users, according to the threads, and the problem reportedly has been narrowed to the ATI Radeon HD cards inside the iMac."
Read more: http://www.macnn.com/articles/07/10/04/imac.freezing.redux/#ixzz1yQ8CLgsg
I can't say I trust Apple as I used to...

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