Same for me, I can hear background music but I still see my desktop and everything is frozen, I have to reboot, even task manager is not responding. Also i did try the repair process they have here https://help.guildwars2.com/hc/en-us/articles/201863008-Repairing-the-Game-Client, and it froze again, (the client is not responding).
Edit: As someone mentioned in the earlier comments= ctrl shift esc for task manager, then press G on your keyboard then Delete button, to save you from reboots