I have had my arduino uno for about 3 months, it was working great untill it stoped being recognized by my windows 7 Toshiba.
I tried, everything, re downloading the IDE and drivers, trying different USB Cables, different USB ports, different computers and various operating systems, and it wasn't recognized by any of the computers.
When I plug it in it is not recognized in the device manager.
I always get the same message : serial port com 5 not found, have you selected the right one from tools > serial port.
But when I do that the Serial Port menu is grayed out.
This is the same for all usb cables, all usb ports and all computers.
So finally I decided i must have burnt out my Atmega 328, so I ordered a new one with the bootloader on it and it still dosen't work.
I checked for loose and shorted wires on the board.
I have tried uploading with nothing connected to it.
The green led goes on when I plug it in to the computer and the led on pin 13 blinks once when I hit the reset button.
I am so perplexed about what is broken on it.
Also nothing gets hot on it when I plug it in. I have also read through dozens of trouble shooting pages with no luck.
If anybody as any suggestions of what to do, or what you think I burnt out, i would love to hear them.
Thank you so much for the help.