No connection with USB ports

I am using the Chrome App and have encountered a problem with the app not communicating with the USB ports. (I am not using the education app.) I have tried several different boards and cords; Uno R3, Mega, nano. None work. Last week i was able to program several nanos with no issue. i did delete the app and redownload it to try and resolve the issue.
Has anybody encountered this issue? Any suggestions are welcome. Thank you.

Every time you insert an Arduino, verify in the IDE: TOOLS >> PORT >> (your port) and TOOLS >> BOARD >> (your board)

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