USB is highly unreliable as far as I'm concerned, sometimes it works (VERY NIIICE), sometimes it doesn't.

Well, it was working for me a while back, now it has stopped working.

Specifically my U2713H USB hub doesn't recognise any USB devices. There is power there since I charge my phone there every day, but none of my USB devices can be used through it.

Admittedly I was playing around with trying to get USB to get recognised in Oracle VirtualBox, so perhaps I broke something somewhere.

How do I go about getting it to work again? I've tried plugging in the USB connector cable to a different slot in my computer with no luck.