Signa S1 Issues...

Hey, so I've been having some troubles with my Signa S1 and subwoofer- They used to work perfectly well, but now there's no sound at all- It's all plugged in correctly and is receiving power, It's not muted and I've messed with the volume, still no sound. I've un plugged it and plugged it in again, nothing seems to work- can anyone help me out?

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