Laptop won't connect to internet through home hub

Hi

After disconnecting my laptop from the home hub it doesn't want to reconnect.

I get a yellow exclamation mark and also shows a red cross between the hub and the internet. i have tried restarting the home hub and also removing the laptop

from the list of devices in the home hub settings with no luck. I am stuck on what to do next.

Any help is appreciated I am using the home hub 5 and connect my laptop via wireless.