How do I brighten my monitor?

I have been trying to brighten my old PB's dim monitor, but most Knowledge doc's indicate a Model Number is needed to proceed correctly with a PMU reset. I just completed a PRAM reset but that did not help.
Can someone please tell me how to find the Model number of my computer?
I have taken the battery out and there is no Model Number in it's cavity underneath the computer. I have also looked in the Pref's again without finding a Model Number.
I purchased my G4 17" 1.33 Gh PB in December of 2003, if that helps. Any help will be appreciated.
Thanks!

Hello Alan,
Thanks for the help.
The Knowledge Doc that you linked me to was the same KD (Title anyway) that I was perusing. And somewhere in there it wanted a Model Number. Anyway, all of that is history.
I just finished the PMU reset and the monitor brightness may have perked up just a trifle, but that may just me dreaming that it did. In truth, I have absolutely nothing to compare it to, so it is what it is. And, add to that the fact that I have recently purchased a refurbed 24' iMac whose monitor brightness nearly gives me a headache. Am now using Shades which helps a lot.
Back on topic: My old PB is still useable for my photography and travel, so this is not the end of the world for me - or it. Just old age setting in. Happens all the time.
I appreciate the help.
Phillip
PS. How's the snow at your end??

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