Monitor no longer detected

I just added an ACER x193w LCD monitor to my G4 Digital Audio. It initially recognized the monitor and type and gave me the appropriate resolution options in the display pref. After 2 days it now fails to recognize the model and just gives me the generic vga monitor options which isn't appropriate because its a widescreen monitor and I can't get a high enough resolution options now. Anyone have this same issue? How can I get computer to recognize the correct model and type monitor? "Detect displays" does nothing.

hey, if this is a repost how about a link to the original with the answer? I'd like to know as well.

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