I was working with an Arduino UNO and a spark fun Serial GLCD connected to the TX-> pin through a 1k resistor.
I had a intermittent power issue with the LCD so I fiddled with the wires although I don't think that anything shorted.
I then made some changes to the code and hit upload only to be greeted by "COM7 not found"
So I unplugged the Arduino and plugged it back in. Windows gave me a popup "USB device not recognized"
I tried another USB port an this time got nothing. Not even a change in device manager.
Removing the LCD display did not change anything either. When plugged into my Linux laptop there was no response from dmesg.
Strangely enough when I plugged it back into my Vista desktop and connected the LCD screens power connector it gave me another USB device not recognized popup so I tried the same thing on Linux and after several times dmseg spit out
USB 5-1: new full speed USB device using uhci_hcd and address 21
USB 5-1: device not accepting address 21, error -71
hub 5-0:1.0: unable to enumerate USB device on port 1
Writing to /dev/ttyACM0 (which was assigned when it was working) succeeded and even made garbage display on the LCD but attempts to change baud rate caused "Inappropriate ioctl for device"
I don't see why it failed. Did I seriously fry a third serial to USB convert chip?