The Hub is on, but your WiFi is not
It looks like there is a loose connection in your home, here are some simple steps to follow to check your connections
Make sure the Hub's power supply is firmly connected between the wall and the Hub, and make sure the power is switched on.
Make sure the white cable is tightly connected into the Virgin Media wall socket.
From the wall socket follow the cable making sure it's tightly connected to the splitter and the back of the Hub.