Display not working with Mac mini I recently bought a new LG Ultrawide display.

I connected it to my Mac mini with a Display Port to HDMI cable.

But nothing is showing up on it. But it is working with HDMI cable over HDMI port.

What is wrong?
Some Mini DisplayPort to HDMI adapters won't support HDMI at higher resolutions, it is possible this adapter won't work at the higher resolution of your new monitor.

At work myself and my colleagues have found this is the case with a lot of cheaper adapters I used to buy, such as this one:

https://www.startech.com/AV/Displayport-Converters/Mini-DisplayPort-to-HDMI-Cable-Adapter-Converter~MDP2HDMI

You could try a new adapter, these are the ones we buy at work and they seem to work well:

https://www.amazon.co.uk/Griffin-GC17096-Video-Display-Converter/dp/B003CK8TZ8