Why doesn't the USB cable charge from PC?

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First off, I'm not some dumbass who doesn't know that the USB cable has to be in a wall jack to charge the NT. I'm just curious as to why this cable only charges with a wall jack and not when it's plugged into a computer...

Because

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Well it does not give out enough power from the computer.

so it does not charge quickly.

But if you plug the cable in to your computer and the nook while leaving it on overnight, it should charge.

so it does charge, but just really slowly
(click dem thanks buttons)

Helps to turn the screen off too.

Sent from my BNTV250 using Tapatalk

Wall charger is 2000ma most PC USB are 500ma max.

I don't think the 500mA limit is the whole story. My Nook won't charge off of other 2A USB charger I have nor with any other cable (even if using the Nook charger).


EDIT:
http://forum.xda-developers.com/show....php?t=1386602

You need the stock cable to charge at the higher rate with compatible 2A chargers. Compatible chargers will have the data pins shorted. I've found that my HTC HD2's charger will actually charge my NT at the higher current as long as I use the NT's stock cable.