PB G4 1GHz - External Monitor flashing but eventually works

Something weird is going on with my Powerbook when I connect it to an external monitor.
When I plug in the monitor the Powerbook will detect the external display, but the external monitor will flash on and off, intermittently displaying the screen, but then cutting out.
With enough switching between mirrored and extended mode, the monitor will external will eventually work and the image will stay put. But if the computer goes to sleep, the whole thing happens again.
Is this just my video card acting up (no solution possible) or are there monitor 'drivers' out there?
Thanks!

Check if the connections are loose or get a new cable.
Do you use DVI-D (Stable) or VGA (Don't know) or VGA w/VGA to DVI-D transformer(Unstable: I use it for connecting my TV to my PowerBook)

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