24 inch iMac Screen problems after 10.5 upgrade

After upgrading to 10.5 i have had many issues with the display my iMac (white) 24inch Core 2 Duo. I have corruption resulting in horizontal lines across open windows and in some cases on the desktop itself. Some of the button text turns bright green. The iMac in question was purchased with the NVIDIA GeForce 7600 GT graphic card upgrade. I have run the 10.5.1 software update and the firmware is all up to date. Has anyone had the same issues? Does anyone have a fix? Help please.
I have upgraded my MacBook with no issues at all!

If your iMac keeps on freezing it could be a hard ware problem, the first thing to do is run Apple Hardware Test on your iMac.

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Last edited by latgarf (2013-08-04 21:18:04)

Thanks, andrekp, but it didn't work on my UX21A.
Here's what I did (screen stays black all throughout):
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3. speaker-test <enter> - I hear noise. Ctl+c to get out (noise stops).
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Again, screen stayed dark as night all the time, so the problem remains.
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Hello!
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http://www.capecodgraphics.com/pages/macintosh.html
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one company has a special process and wanted to sell something;
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iMac while starting it up.. and bingo! It didn't shut down this time! The
screen was black, but it was up and running to some extent. I hooked up
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keyboard or mouse. What now? I stuck my OS 9.2 CD into the slot, did
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was able to do a clean install of the OS to upgrade it from 9.0 to 9.2,
restart the Mac; then upgrade its firmware..." -- may not be repeatable.
Anyway, hopefully you get more feedback on this and a resolution solution!

24 inch iMac Screen problems after 10.5 upgrade

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