Arch Linux install: wlan0 is up but not connecting to Wi-Fi

I'm trying to install Arch Linux on a Lenovo Harman/Kardon IdeaCentre, and I can't start a working internet connection.

This is after I have connected to my home Wi-Fi. I tried using an external network interface but that did not work, I also tried running

I have watched a couple of videos and nothing seemed to help. I tried running ip link set wlan0 up but that didn't seem to do anything. I have rebooted several times and that also didn't help. This is what comes up for wlan0 interface when I run ip link: