How to connect a PS4 to an All In One Desktop?

With no model number, can't help much. Read your user manual or search Google for how to. Or:
https://forums.lenovo.com/...-p/1725769

Lenovo B40/B50 series

Hdmi… In… Port? Are you really sure of that?

Above power button on right hand side a little button above press that

Can I use my Lenovo all in one computer as a monitor for my ps4? 57327150 machine type

Can i use ps 4 slim on lenovo c260

how do I connect my ps4 controller to mh lenova computer

im using a lenovo b540 ideacentre AIO and the hdmi cable is plugged into both the pc and ps4 but im pressing the touchscreen source button and it doesnt give me the option to switch over to hdmi mode, it just stays on pc mode.

I bought the Lenovo and it has a HDMI IN PORT at the back, but no button for me to change the mode from pc to hdmi like a laptop does.

When my Hdmi is inputed for my ps4 it says power saving mode

Can't connect to wireless LAN

Can't connect wirelessly from my tablet