I setup my Arduino Uno with an LCD display and 12v power adapter to power it without the USB cable. Everything worked fine initially, but now when I've went to tinker with it again my board isn't recognized. I was using the COM4 port and now that option isn't available. Here's the error code I get w…

Arduino was working fine at first and now its not recognized

ieee488 April 11, 2018, 2:40am 2

What does the Device Manager show?

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