Washed out colors - brightness too bright - fix?

Hello!
Well, I'm currently running a 400 mhz, slot loading, iMac DVSE (spring 2000), equipped with 10.4.8, 512 MB ram, and an 80G hard drive!
However, now that i've upgraded to tiger, and am using this old machine far more, I've noticed that the display looks a bit funky - the colors seem a bit light - particuarly the blacks.
I've used the color calibration app, but although better, the blacks are still way to bright - a sort of dark, charcoal gray. The reason I think it's the brightness is that I have an old CRT attached to my Powerbook that when turned to maximum brightness, has the same gray-blacks. Droping the brightness to around 75% gives the colors their true, deep hues. This is nice, considering my desktop is a rotation of Hubble Space Telescope pics! I have turned down the brightness as far as the displays system pref will allow -but it's too bright.
I know that one of the CRT iMacs has an internal brightness dial somewhere - but I don't remember which model or where it is/how to access. Does anyone know? I'd be a good fix. I'm willing to open up the iMac if neccessary - I need to install a PRAM battery too!
Thanks,
-Dan
PS: When attached to the external CRT, the blacks look great - just like on the Powerbook - so it's not an internal video issue with the iMac that I know of.

Hello!
Yes - PRAM doesn't help.
PRAM batt is dead, has been for a while. I do need one soon...
I'll try a FW drive boot (has 10.4.7 on it), to see if that helps - but it's been bright like this for quite a while. I never really noticed, because before Tiger, all the iMac was used for was a iTunes and OS 9 games playing, weather radar checking machine. Now I'll do work on it during the day - say, when I'm home between classes and need to work on a lab report, but don't want to unpack my powerbook for just one hour. Not only that, but with these space-desktops, the brightness is just more visible. Hmm.... I wonder if I turned up the gamma to far during calibration.... checks
But the question still stands: is there any sort of internal control for brightness? It may have been the tray-loading iMacs that had that.
Thanks,
Dan.

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