Our mac pro went to a very faint display and we can't fix it.

Our week old mac book pro suddenly has a very faint display, almost all black and we can't fix it. We've re-started etc.

I assume you have tried the "obvious" stuff, like using the brightness buttons (F1 = dimmer, F2 = brighter) or turning up brightness in system preferences>displays. I'm sure you tried all that, but I just had to say it just in case. Anyway, you may want to try reseting your PMU...
PMU stands for Power Management Unit and it is a chip that controls the backlighting of your display (among other things). To reset your PMU do the following:
1. If the computer is on, turn it off.
2. Disconnect the AC Adapter and remove the computer's battery.
3. Press and hold down the power button for 5 seconds and then release the button.
4. Reconnect the battery and AC Adapter.
5. Press the Power button to restart the computer.
Those are the official apple instructions, but I suggest in step 3 you hold the power button down for 10 seconds.
Here is a link that refers to reseting the PMU on a MacBook.
http://docs.info.apple.com/article.html?artnum=303319
good luck!

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