Cyan (no red channel) Display

External display has stopped (intermitently) showing red, effect is that everything has a very heavy cyan cast. I've checked the monitor, cable and adapter with another macbook; the problem isn't there.
Full color returned for a day and just popped off again. There were no big shakes on the desk, so if it is an internal broken connection its a tiny one. What could be causing this?  What can I check?
I've already done the sleep, reset, powerdown, SMC reset

It looks like a late 2006 model, but with 1 gig of ram.
I'm using the dvi to vga adapter that came with. All the pins are fine.
I don't think the problem is hardware related. When the screen flashes, when I'm changing the display path, the colors seem to normalize for a moment.

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