I have been using a Nano to display pressure and temperature sensor values to an OLED i2c display. I have had the board for a month or two and I have not encountered any problems. After changing a pull up resistor however, the board was no longer recognized by my laptop. I could not select a serial port, and the device did not show up in device manager. It also did not show up on several other computers and using several different USB cords. The board's led still lights up when given power from the USB, but could some other part of the board be fried? The problem happened after soldering a resistor from analog pin 0 to +5v, and I don't think I accidentally shorted something/removed a connection with the soldering iron. I also do not think I have supplied over voltage to anything on the board either, because I have only used a USB and 3 AA batteries in series to power it.
I looked on this forum for people with similar problems where the board was not recognized by the computer, but their issues mostly happened on one computer or when they first attempted to power up their boards. I have tried to update the drivers to see if that might fix the issue, but it always says they are up to date.
I am still not sure if this is a problem with software or the board itself. Any thoughts?