Intel iMac brightness/power management problem

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Hello,

I have a problem with my iMac which I hope to address. My machine is an Intel based the entry level iMac 1.86GHz Core Duo system with OS X Leopard 10.5.5 installed. This problem has been present every since I had ordered the used machine, and installing various update seems to have did nothing to address the issue. The problem occurs when ever I schedule the Mac to shutdown/restart. After I turn it back own, the screen’s brightness is turned all the way down, and I have to manually adjust screen’s brightness to its original settings.

Is this a know issue with iMacs, and if so is there any way to fix this problem? Thank you. :)
 

chscag

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Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
Read the following Apple KB article. Try the procedure given in the article and let us know.

Regards.
 

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