24" iMac Screen Freezes since 10.6.3 update - pls help!

Hi everyone,

I have not read all post's since my last response, but I have some info about our problem.

When I'm updated to Lion via MacApple store i have freeze in about 10 minutes, but after I make clean install Lion on my disk I don't have any freeze yet.

I installed the system from a USB drive, this tutorial can help to create it: http://bit.ly/pphvMq

After clean-installing Lion (just like you did), my iMac lasted two days without freezes, then it started again. I still hope you'll have more luck.

I installed the kextfix on Lion and it runs much smoother now. The animations when going in-to fullscreen and launchpad on 'vanilla' Lion where very slow. With the kext-fix the animations are much smoother now.

Same problem here ... Black screen. Apple please fix this problem asap.

Had the same problem with my iMac for a long time now. I downgraded to Leopard and waited for Lion. But when I installed Lion, I had the same problems again :-((

Thank you for this thread!! It seems, that for me the kextfix works! No more freezes so far on Lion. Cool.

I hope that Apple will fix the problem in an Update for Lion and we don't have to fix it for our own on each Update...

Same Problem for me... I have the same model...i'm going crazy!!!

It's almost one and a half year of random freezes... no beachball spinnings, no graphic glitches... ONLY freezes...

i've tried everything... clean installs, every possible hardware test (always with no problems).... i don't know what to do...

ARGHH!!!

APPLE YOU MUST SOLVE THIS!!! 51 pages in one thread!!!!

ps. sorry for my bad english...

I'd like to add another bit of data to this saga. Mine is still freezing after 30 to 60 minutes of light usage with and without the KEXT hack, running just stock applications (itunes, ical, imail, etc). However, I've left the machine on and running all these applications for the past week but have not touched it. In all that time, it has not frozen. So it appears it can run indefinitely as long as the screen isn't being actively used. This is further evidence that the problem is related to the graphics driver...

I got the ATI Radeon HD 4850 graphics card and it usually freezes or the screen goes black after playing for a while (World of Warcraft). If I do the kext fix am i supposed to use the ATI4800Controller.kext file from the zip file provided by KrzysiuTurek?

Curently running Mac OS X 10.6.8 on an 2.8 GHz Intel Core i7

At the moment there are 163.386 views on this topic, so Apple you might do something about this graphics card driver and update thingy?!?

Well, that's the thing, I don't think they're reading these.

Maybe if every time we have a freeze, we submitted a trouble report Apple Support they could consider paying some attention to this thread?

I've already submitted a number of them. Whenever the system detects that it went down hard it asks and I send it with some comments...

I just wanted to chime in too. I have a 20" iMac 7,1 and it's display has been randomly locking up for quite some time. I'm trying the kext fix too, since I've tried just about everything else. This really *****. Nice to know I'm not alone. ;-)

Everyone please use the link below to report the bug problem so they know how big this problem is.

http://www.apple.com/feedback/imac.html

Good idea. Done

Two days without a freeze! Thank you again for the kextfix! Without this thread I would have probably thrown my iMac out of the window... Lion is working perfect now... Apple, please fix the problem in the next Lion-Update!