"YOU CANNOT PLAY A BD MOVIE WHILE YOUR SYSTEM IS IN DUAL DISPLAY / CLONE / MULTI-DISPLAY MODE!!! HDCP WILL NOT ALLOW IT, HENCE THE MESSAGE.
The post above was close, but not completely on target about the setting changes.
The problem and message stems from the fact that HDCP prevents any system using multiple displays to play back BD content - most pirating operations use more than one display, so some genius figured to make it harder for them. Yeah, right....
To get your system to play, first make sure you've updated QuickPlay to the latest version - do it from within QuickPlay, not from the HP site. Start QP, then click on the Gear icon in the upper right corner, then select "Update".
If you're using an HDMI cable, you'll also need to set your Sound Options, was correct about that.
1. Open Sound Options from the Control Panel.
2. Click on the Digital Output Device icon, then click on the "default" button to switch the HDX output to the HDMI cable. Yours might say SPDIF or HDMI - it's the same regardless of the old label.
That will redirect your sound to the HDMI and your external display. BTW, the best driver for the HDX 9300 IDT is 6.10.5607.0 - all others seem to either have problems or lower the quality.
Make sure your external display is set to detect incoming HDMI signals or you won't get any display on the channel you've selected to send to.
In the NVIDIA Control Panel:
1. On the Display option, under Multiple Displays, switch your Display Mode to "Use only one display".
2. On the "Select Display you want to Use", select your external display.
3. On the "Select Display you want Windows to use as Primary", select your external display, NOT "Laptop Display".
The Video and Television Color settings will affect the outgoing video signal.
Once your desktop is switched to the external display, start QuickPlay and run your BD - you shouldn't have any problem.