ATI Technologies RADEON 7000 - Manual (Page 38)

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and a higher mode is selected, the display on your
TV will disappear.
Using Games and Applications
Some older games and applications may program
your RADEON™ card directly, to run under a
specific display mode. This may cause your TV
display to turn off automatically or become
scrambled (the PC monitor will not be affected).
Your TV display will be restored once you exit the
game or if you restart your PC.