The S2722DZ only ships with a USB Type-C to C cable. The fault turned out to be the users older HDMI cables. The user purchased two new HDMI cables and everything then worked.
I have a brand new S2722DZ monitor with a brand new Inspiron 15 5510. Cannot connect with HDMI which would be preferrable to me than USB-C as I need that port for something else (ethernet). Cable is good, I've tested it elsewhere and I've tried turning everything off, connecting and restarting. Keep getting 'No HDMI signal from your device'. Help welcome, thank you.
Inspiron 15 5510, S2722DZ HDMI not working