Stereo speaker system stopped working?

So I've had this pioneer speakers system for about 4 months and it suddenly just stopped working. There is two tower speakers and a sub, none of which are producing any sound. The sub won't even turn on. I have checked all the connections which seem fine. I also tried different sources and none of those worked. Any idea what is causing this and how to fix it? Thanks.
Answer:

Sound silly, But is it getting power? Change plugs, Or maybe it's on a different speaker input, input A & B, I have mine hooked to B and sometimes i put the A channel and nothing work. Is that something yours has?

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Other answers

Check the power cord on the subwoofer to make sure you are getting the power. Or you could have blown the amplifier on the subwoofer. If you drive them over what it is rated for then you can burn the amp.. Hope this will help you out.

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