Screen goes very dim after 3-minutes using Leopard

Has anyone had the same experience? I have tried all energy saving settings without success!! Its similar to the screen dimming that MBP users experience with Tiger (I could get around this by unplugging the power supply, and plugging it back in again) only with Leopard the screen goes very dark, almost to the extent that you can't see anything on the screen, and there appears to be no workaround. It takes hold without fail every time the notebook is left to sit untouched for spot on 3-minutes.
Any help would be greatly appreciated!

If it's a consistent 3 minutes to lights out I'd suspect the Energy Saver setting has got 'stuck' somehow, it might be worth trying a Parameter RAM reset - hold down apple/option/p/r keys at start up and wait for three chimes before releasing.

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Jeffdesersa,
Don't worry, ok? This is scary to see but we will help fix it for you. How are you trying to activate the phone? Have you tried connecting the phone to a computer and using iTunes to activate it? Activating that way may just do the trick!
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Screen goes very dim after 3-minutes using Leopard

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