Brightness of the screen

I have an iMac with latest updates and disc permission always done.
However, whenever I restart the computer the brightness of the screen is almost all the way down. I always have to go to the prefs and crank it up again.
Is there a way to fix this?

See if this helps from the Help Menu.
If the images on your display are too light or too dark, you can adjust the display’s brightness.
To adjust your display’s brightness, try one of the following:
Use the brightness control keys. On portable computers, they’re usually the F1 and F2 function keys. On some computers, they’re the F14 and F15 function keys.
If you have a portable computer with ambient light sensing, select Apple menu > System Preferences, click the Displays icon, and then click the Display tab. Select the option to turn on ambient light sensing.
The display automatically adjusts its brightness to match the current lighting level.
Open the Display pane of Displays preferences
Choose Apple menu > System Preferences, click the Displays icon, and then click the Display tab. Drag the Brightness slider to adjust the brightness of your display.
Check the documentation that came with your display to find out how to control its brightness.
Depending on the type of display connected to your computer, the Display pane of Displays preferences may contain a Contrast slider that you can use to adjust the display’s contrast.

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