Det er vel ikke en Philips 190P skærm du har?
From the manual:
Touch the LightFrameTM DR Hot Key for three seconds to enter the LightFrameTM demo mode.
To exit the demonstration mode, press the hot key again.
And:
The LightFrameTM Hot Key is located at front of LightFrameTM DR monitor.
The blue LED is on when LightFrameTM is activated and off when the feature is deactivated.
If that does not work I would go back, because there is apparently little piece ...
Kilde:
http://kortlink.dk/google/bd57
Har du prøvet med en anden skærm?