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Both Hub and PC most probably only deliver a minimal amount of charge. Keep it charging there for at least a day - and try turning the device on. The "empty battery" screen might still be showing when the device is powered off completely. That might have happened when you connected it for the first time. Software glitches can make the Kindle consume much more power than both Hub or PC can deliver (not so for the wall charger, though). It will turn off and you need to manually turn it on again.
Since you said that the wall charger didn't work well lately, though, there is a good chance that the battery is now below the limit of the charging circuitry and won't be charged anymore, i.e. it might be finally "dead" now. Don't expect the Kindle's battery life to continually fade out to zero. It will just drop dead below a certain threshold.
You could still try to sell it on ebay. Other people have Kindles and break their screens, cases, etc. - and might use yours for spare parts. Or you could decide to buy a replacement battery, but a fair warning: it's not for the unexperienced. Not too hard either, I think.
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