Green LED under left speaker grille

Hello,
I noticed there is a tiny green LED that is visible under the left speaker grille on my MacBook Pro 17".
It is not visible from directly above, but is quite visible from normal typing position in an office.
The light shines from a single hole in the left speaker grille (the array of perforation holes from which the sound comes) next to the keyboard.
The hole is in row 4 from the front (front means the part of the Mac closest to me when typing) and column 15 from the right. I am average height and it comes into view and disappears if I move my head forward toward the Mac and back within a range of 10cm.
It is not the caps lock light, rather it is a very tiny bright green LED. It isn't ugly, though it does distract my eye.
Perhaps it is a RAM logic related light, or something related to the microphone, the ambient light sensor. What is it, and can it be turned on and off?

Hi Matt, I read your post some time back and wondered myself. I have seen the light after I took the top cover off for other reasons. Last night it dawned on me what it was. There are two, one is on the other side under the right grill. They are optical sensors that control the back lighting for the keyboard. During the day, put your hands over the two grills. The screen will darken and the keyboards back lighting will come on.
Hope this ends the mystery.
Cheers,
Glynn

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Apple Retail Store - Genius Bar
If not under warranty Apple will exchange your iPod for a refurbished one for this price. They do not fix yours.
Apple - iPod Repair price
A third-party place like the following will replace the jack for less. Google for more.
iPhone Repair, Service & Parts: iPod Touch, iPad, MacBook Pro Screens
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This is my first post, but I'm a longtime lurker
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aliarroughi wrote:
Hi Buddy
I'm just bought and using brand new blackberry Z10 for a month. Everything works fine, I do love the OS, way more better than my old dakota. Especially since I update 10.2.1 now I'm able to install all android application
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