I tried the only two USB 3.0 ports on the computer. Same issue with each. I also tried the USB 2.0 port on the left side and it flickered as well. I checked for new USB drivers but did not find anything newer than the installed one (Microsoft ver. 6.3.9600.17031 - 2/21/2014) for the Intel USB 3.0 eXtensible Host Controller.
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