A few minutes ago, I suddenly lost all responsiveness in my optical USB mouse. Turning it over, the LED on the bottom had gone out. My USB keyboard was still operational, so it couldn't have been the computer.
After connecting the mouse to a different USB port, it started working again. I tried connecting the keyboard to the port the mouse had been in, to confirm that's where the problem was, and it did indeed stop working.
Has anyone experienced sudden and complete loss of functionality in one USB port before? This is two ports of six that I've lost since purchasing this computer, the first being after I tried to force a USB device in the wrong way ages back.