A scanner attaches to an unpowered USB hub. The scanner is not detected when attached to the hub, but another USB device works fine. What is the first thing you should check?
A) Ensure the correct USB cable is being used.
B) Ensure the scanner is receiving enough power to power on.
C) Ensure the USB cable is not too long.
D) Ensure the computer USB power is not disabled.

Question

Quizplus · Accepted Answer

Since the other USB device is working fine, it suggests that the USB hub itself is working properly. The fact that the scanner is not detected could be because it's not receiving enough power to power on. Therefore, the first thing to check would be if the scanner is receiving enough power.

A Scanner Attaches to an Unpowered USB Hub