It was working just fine yesterday, I could upload and Serial Monitor also was working. When I fired up Arduino IDE (version 1.6.9) this morning I found nothing is working, an my compile sketch decrease by almost 6K. I'm unable to upload my sketch, an Serial Monitor will not open. It seems that some how the com port has change from com port 3 to com port 4. So I went to TOOLS -> PORT an found it greyed out. Clicking on it does nothing.
I have reloaded the IDE with out success. When I reset the board Windows does not recolonize the board.
So the question what I do to cuase this problem? How do I get it up working again?
Windows 10 an Adafruit Feather M0.