PB incorrectly identifies external display?

Hi everyone!
I recently purchased a Sceptre X22WG-1080p monitor for my PowerBook G4 (17", 1.67ghz), having enjoyed using a similar Sceptre display with my work MBP. However, I've just had a nightmare of a time trying to get this to display properly on my G4.
When I attach the monitor, the PB recognizes it as a "Sceptre X22HG" - a completely different product. I also can't get the resolution to display properly: setting it to a 1680x1050 resolution at 60hz (the supposed normal resolution for the monitor) displays stretched and, worse, partly off the lefthand side of the screen. No amount of horizontal adjustment on the monitor preferences will bring it far enough to the right. Also, the picture displayed won't fill up the screen - there is about half an inch of empty screen at the top and bottom. The same problem occurs on the aforementioned 17" PowerBook running 10.5.4 and on my TiBook running 10.4.11 - both 'Books handle other external displays properly.
Sceptre tech support, of course, has relatively no idea what a Mac is, though Macs are listed as being supported by the hardware. The tech guy told me to adjust the scaling on my video card (in this case, ATI radeon 9700) to "full screen", but as far as I know there isn't a way to do that in OSX. I've played around with DisplayConfigX, but can't make head nor tail of what I can do to fix this. Anyone have any thoughts? Drivers? I have a hunch that if I can just get the PB to call the monitor by it's true name that this will work itself out. But how?
Thanks so much for your help and time!
All the best,
Ryan

http://www.info.apple.com/kbnum/n88064

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Hey there all, this is my first post here. It looks like some people have had similar issues—particularly with an incomplete/incorrect list of resolutions being provided for external displays.
I am shopping around for an external display for my MacBook (my specs are included) and I tested a few different ones today, but encountered problems.
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It's unusual to strike out like that with three different monitors using two different adapters. On the other hand, with all the video issues that have been reported by others on these forums since the 10.5.7 update, it's not too surprising.
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PB incorrectly identifies external display?

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