I have been trying to get a Lenovo laptop to work with my Beosystem 3, with no success.  I have tried attaching the laptop to all of the HDMI ports via AV4.  The laptop does not recognize the Beosystem 3 as a monitor, and the Beosystem 3 does not recognize the PC as an audio source.  I have tried an HDMI splitter to attach the monitor (LG 52" OLED) and the BeoSystem 3 simultaneously.  The laptop sees the monitor, but still no luck with the audio through the BeoSystem 3.  Any suggestions?