When we connect external LCD display colors get distorted, a NEW problem

We have used an Envision external LCD monitor with this iBook for one year with no problems, and now suddenly when we connect it to the iBook the colors are all way distorted (no red, or all blue), on both the iBook display and on the external monotor. When we disconnect the external monitor the colors on the iBook display return to normal. HELP!!!! What could be causing this?
Thank you!

Changing the adaptor cable solved the problem.

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