We recently had a customer who had been using 4- MS4's with USB interfaces for a couple of years with no problems. He comes in one morning and none of them show up as a virtual com port on his system. They appeared powered up but the Green and Blue lights were both on.
Turns out the power supply to his 4 port USB hub went bad so only power from the PC's USB port was helping the scanners.
A USB port will power 1 MS4 but not 4 going out to a hub - unless the hub is powered.
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