Dvd player screen dims while playing a DVD

It is happening on both my iMacs (a G4 and the new dual Intel. while watching a movie the screen dims a bit every so often and then brighten up again. Any suggestions?

Hi,
thanks for checking in. I have had the other screen dim issue where the mouse needs to be moved to power the screen up full. It is not this issue. The screen dims for one second and then brightens up again on its own, too quick to know if moving the mouse would also restore the brightness. The issue happens on all movie dvds, home made or professional.
I have not tried another dvd player as this iMac is in the living room and it is front row, with it's sweet little remote, that makes the iMac our replacement for a TV. (It happens in both front row and dvd player.)
I am hoping to solve this problem rather than switch players, but fdor laughs, when I get home Monday I will download another player and see what happens, it will be an interesting experiment.
I will keep you posted!

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Dvd player screen dims while playing a DVD

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