Question on the A1038 Cinema Display

A friend recently gave me his old display. I have a couple of questions about it - one of which I'm guessing I already know the answer to.
First, I have the display hooked up to the DVI video on the G4. I did not hook up the USB cable. The power light flashes 3 times, then off and repeats as long as the Mac is on. Any concerns about this? What does this indicate out of curiosity? I'm guessing my hook up may be a contributor.
Second, I love the sharpness of the image - especially after using a CRT display for years. The screen is a bit darker at the top compared to the bottom of the display. I am thinking the back lights are bad. Can this be remedied by myself or is it something I'll have to get used to? At this time the majority of the work I do doesn't require an evenly lit display. If I start doing more image editing again I can always plug my older monitor in since I have two video outs on the G4.
Thanks for any thoughts or help that is offered.

First do an smc reset when changing system configurations.  Do pram reset to just for the heck of it.
Next check or try to set your audio via Audio MIDI Setup (in Utilities).  See if you have better luck with that instead of the Sound preferences.

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