How to change screen brightness on imac
On most keyboards, there are two keys, (in the f-key row, typically,) that look like a little sun, and a slightly bigger sun, (a circle with lines radiating outward.) The smaller one dims the display, the larger brightens - - when they're working. Sometimes, for whatever reason, they may not. (Doing a full restart will usually fix the problem.) If you don't want to restart, or if that didn't fix the keys, you will have to open System Preferences, (found in the Applications folder, and possibly in the Dock, also.) Once you launch System Preferences, click on Displays and you should find a slider labelled, "brightness." Click & drag to the desired brightness. Easy!
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