Problems with new display, "Input not supported"

So, I just got myself a new LCD screen (Acer AL2016WCbd) for my G4 (DP 1Ghz Quicksilver 2002 w/ 10.5 installed). The monitor seems to work alright and everything with my Windows box, but whenever I try to use it with my G4 the monitor goes black, flashes an error box saying "Input not supported," and then goes to sleep. It does show the boot screen... the gray background and Apple logo... but goes black after that.
I've tried rebooting, resetting the PMU, tried booting in Single User and Verbose mode, tried hooking the G4 up to another monitor and lowering the resolution to 800x600 @ 75Hz and then reconnecting the Acer, but no dice.
My only other ideas are to try hooking it up over DVI instead of VGA (though I'd need to get an adapter for that); playing around with a few different things in target disk mode by hooking it up to my laptop (which I don't currently have); and trying to boot from my Leopard install disk (when I find it). Might any of these things do any good? Is there anything else I haven't thought of? Or am I just wasting my time?

OK, so I can get the display working if I first boot up with another display, set the resolution to whatever I want it to be, then hotswap in the Acer that's been giving me the problems. But once I restart my computer I have to go through the whole process again. Either the tower isn't picking up on the display profile from the monitor or the monitor just isn't sending it to the tower.
My question now is: is there a way to for me to lock the resolution and refresh rate, so it always outputs at, say, 1680x1050 at 60Hz? Both Newegg and Acer have been giving me all kinds of (excuse me here) sh** about how they can't help me, so I really don't want to deal with them anymore by having to return/exchange the monitor or get it serviced. I mean, I know the thing works and I know the resolution I want it to run at. I just want to be able to lock it so Leopard doesn't revert to some unsupported output every time I reboot.

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