Green tint when hooking G4 PowerBook up to LCD projection

I've been hooking up my G4 to external projection for presentations for a long time and then all of a sudden last week whenever I hooked up to display information to a group the projected image had a green tint. The image always looks fine on my computer but the projected display is really ugly and hard to look at. Any ideas on what the problem is?
G4 Mac OS X (10.4.5)

Hi lwb2000;
First issue: "Green tint" Possible cause - damaged DVI connector in Powerbook, monitor video cable not seated correctly, monitor video cable may be damaged, or monitor connector on video projector may be damaged. Inspect the connectors at all points in the chain.
Second issue: "display is really ugly and hard to look at" Launch Display Preferences in System Preferences and calibrate (under the 'color' tab) the projector monitor settings.
Hopefully this will help you.
Take care.

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