Curiosity kill the computer port. But why? I bought a 4 port USB 2.0 hub. I removed Vcc and Gnd from the Type A connector of the hub. Then I powered the hub and inserted a USB stick into one of the hub's ports. Then I inserted the hub's Type A connector into a computer (only D+,D- connected). I was curious to see if the computer could see the USB stick using only power from the USB hub. Seems like the computer kinda/sorta wanted to see the USB stick by the normal audio you hear when plug a usb device in. But the audio came on and off.
In the end, I damaged the usb port of the computer. I tried another USB port and damaged it too. In theory, seems like this should have worked. The only thing that could have damaged the computer is the D+, D- lines of the Type A connector.....never thought I could damage a port but maybe because I used a different power outlet for the usb hub than the computer, maybe that's why it was damaged? Voltage on D+, D- must have been slightly higher to damage it?
Am I thinking right or wrong? Any ideas?