External monitor sound not recognized

[BustaPimms]

Hi,I just received a new Philips 345B1C ultrawide monitor and connected it via an HDMI cable to my Dell Inspiron 5400 AIO PC running the latest version of Windows 11 with all latest updates installed.The display shows perfectly but the sound will not play through the monitor, just through the PC speaker as normal, and there is a slight buzzing sound coming from the display when connected to the PC.I connected my XBOX to the monitor and that plays the sound fine with no buzzing, and connected another laptop to the monitor and that plays fine too.All drivers are up to date and I have tried diffe

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