Sunfire HRS-10, no sound

Hello everyone, my first post here.

I'm having a problem with my subwoofer which is turning on but isn't making any sound whatsoever. When I switch it on, I hear a few clicks which I also heard when it was working, then the small red LED lights up but its very very faint, so I'm guessing it's in "Standby Mode". But when I plug my audio cable to it it doesnt switch to being on. I tried plugging the audio cable into my older sub and that works fine. Does anyone have an idea of what it might be? And is it an easy fix? Thanks in advance!

I have checked the power cable fuse btw.