No way to Dim the brightness of the display on the iMac to 2014

I bought an iMac 27 inch nine in August 2014. Model no. A1419. It has been manufactured in 2013. As far as I can remember, there has never been the brightness slider in the display preferences and unction keys have never dimmed the screen. Initially, I ignored the problem but 2015 intense brightness became a real problem so I tried everything I could think of to correct it. Advice of the seller's customer support and reseller Apple has not managed to get a solution. More and more, it seems like a hardware problem or something in the Boot ROM. I am now on OSX El Capitan, which actually has no difference.

Any suggestions please?

I use the software "Shady"... This allows me to control brightness for as low as possible... you can try it once and check if it works...

Tags: Mac

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