Ambient light no longer works

Hello, first the background: I have a late 2006 Core 2 Duo iMac. It's been operating beautifully since its purchase, and everything is in perfect working order. Except one thing.
My ambient light sensor no longer seems to work properly. The white LED that goes on either when the display is off or the computer is in Sleep mode is at full brightness all the time.
When the computer is in Sleep mode, normally it's supposed to sense how much light is in the surrounding area and adjust accordingly, but now it pulsates at full brightness no matter how dark my room is. And when the display turns off, the light is at full brightness no matter what the darkness.
It has been this way since I installed the Developer Tools from the retail Mac OS X Tiger disk instead of the disks that came with my iMac. When I removed the Developer Tools I noticed that the sleep light wasn't functioning properly.
I did a Apple Hardware test, which came back error-free. I have no hacks on my machine at all. So the only thing I can think of that did it was my blunder with the Developer Tools.
Any ideas as to how to correct this? Thank you.

Unless you have a lot of 3rd party hacks and stuff in Mac OS X on your iMac, there isn't much to an Archive & Install, except the time for the Installer to do its job. Then you drag the Previous System to the Trash and flush and you are on your way. I would remove the Developer Tools first.
The issue with the Retail disk for Tiger is that it isn't Universal binary, it's all PowerPC. The Mac OS X Installer on my Retail disk won't even run on my iMac Intel. I was surprised to see that it does let you install the Developer Tools!

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Yes, as I said in my first post, that box is toggled. It still doesn't work. I've tried turning it off and back on and it still doesn't work.
I haven't even had this computer for a year yet already it's breaking down. 3 months after I bought I had to have the LED replaced because it was defective, and now this.
Why is this professional laptop that costs as much as it does breaking down after barely a year? I never had these problems with my IBM ThinkPad laptop. I only needed to take it in for support after 4 years of solid performance.
I don't expect to see these problems in a supposedly professional computer that is barely a year old.
Oh well.
Message was edited by: orbit82
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Ambient light no longer works

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