S2421HS, HDMI issue

The monitor is no longer recognising HDMI signal from my Asus Windows 11 laptop. The laptop has been tested with a different Dell monitor and the HDMI port and cable are working 100% fine. The monitor is out of warranty, and was actually a second replacement for 2 previous faulty and damaged units supplied by Dell. New HDMI cable made no difference. Is it worth trying HDMI to DP I wonder?

Thanks in advance.

James