My Klipsch synergy subwoofer not working. Hi there, I've got Klipsch spearker with Sony STRDA

Question

Hi there, I've got Klipsch spearker with Sony STRDA 5200 receiver. I've been using it for last 18-19 months. I've noticed that yesterday when i've turned on the system, the subwoofer didn't start at all. I don't know what's wrong or where to look for? The only thing i've checked is the fuse. But how do i know whether it's fuse? I can see the dim light on the subwoofer which i see generally when it's working. Any help or guidance is appreciated. Thanks. Vivek