My screen's backlight keeps getting dimmer then brighter.

The backlight on the screen will stay bright and then dims and then will get brighter again. Do I have to bring it in? I have an IMAC.

Sounds like a bad connection or a failing backlight.
I've seen a couple of iffy DIY's for bad backlight connections, however it is probably best to have your local Apple Authorized Service Provider tackle the problem.
go to > Apple - Find Locations

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