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just found a firmware update that fixes 24" cinema display flicker, and it works, please go to link and follow instructions .http://support.apple.com/kb/TS4045 hope this works for you too.

I know this is an old thread, but I just got a second Cinema 24" and wanted to ensure it had the latest firmware (there is a sound problem). The above link is dead. Does anyone have a link to the latest Apple Firmware ( I can´t find on their site).

Thanks
 
Checking the address of the link, it seems to be Apple, so I decided to try installing, but after going through the setup I got a warning that this update was not compatible with my version of MacOS and it could damage my system, so I aborted.



Any idea how to update this monitor, short of finding someone running really old MacOS?
 
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