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Which mac? A notebook? Did you try one of the two buttons next to the "off" button? I think it has a big sun like image and a little sun like image.
 
By default, you don't need to use the Fn key.

Oops my mistake forget using the fn key, don't know why I said that cause I don't need to use it lol. I was think he needed to use the f6 key sorry. Yeah so all you need to do if hit the f6 key or which ever one you have that has the big symbol of a line and a semi circle of dashes representing light
 
when i tried f6, there was this circle and a slash inside it, an im pretty sure that its NOT broken
 
You're hitting the right key, so get it to a darker room. Mine won't turn on either when the ambient light is bright enough.
 
Put your hand over the isight. Or if you're in a dark room shine a light into it.

Aren't those activities exactly opposite? Putting your finger/hand over the iSight would be the correct option. Shining a light into it would resemble being outside in the daytime.
 
I'm amazed nobody's told the OP to check System Preferences, in the Keyboard pane. There's a setting there for whether to use the Ambient Light Sensor or not. If that's turned on, and the room's too light to trigger the sensor, that would explain the behavior. Also worth a try is turning that setting off and using F5/F6 to manually control the backlight.
 
Aren't those activities exactly opposite? Putting your finger/hand over the iSight would be the correct option. Shining a light into it would resemble being outside in the daytime.

Yeah, I forgot to say that that's a way to test its functionality. sry. :eek:
 
Check out a free app called "Lab Tick", it will put a icon in the upper right hand corner of the screen that will control the keyboard illumination without having to mess with keyboard.
 
when i tried f6, there was this circle and a slash inside it, an im pretty sure that its NOT broken

yeah, too much light. if you want to be sure it's not broken, hold your finger over the light sensor, right to the left of the iSight cam.
 
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