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First check all the connections. Something as simple as a loose wire will cause your sub to shut down. If all connections are secure, then your coils on the sub itself may have come apart. To test, try pushing in the center of the sub as it is playing. If sound comes out, it's your coils.
i had the same problem a few times, they are pretty picky receivers.
first take a look in your settings and make sure none of your speakers are set on large, if they are they automatically shut off the woofer,
2, try the adjust option and crank the bass and throw on the bass boost
3. manually turn the woofer on through the receiver itself
4. try and turn up the woofer itself if is powered
5. try hooking the woofer up to the secondary speaker jacks by bridging it, (positive on left and negative on right for even power)
if none of these options work then the woofer itself may be defective even though it lights up
The display is back-illuminated by small incandescent bulbs. Burnt out bulbs equal no display, although the chances of several bulbs failing at once is not high so the power supply for the display/bulb assembly is a good place from which to start fault finding.
It needs a repair shop - as a user there's nothing you can simply dig into to fix.