Connected to internet but nothing loads

Every device in the house works with the WiFi. Phones, Alexa, TV, Ring, everything.

I just bought a new computer and it shows that I’m connected to the WiFi (no yellow triangle) but NOTHING loads. I’ve connected to the xfinity hot spot so I know it’s not my hardware. I’ve tried resetting the router and as soon as it pops back up, I can load a single web page but then it won’t load anything after a few seconds. And again, it shows I’m connected.

I’ve tried all the command prompts you can think of and nothing works.