Hi everyone,
I'm doing a robot for school project,
Im using an Arduino UNO but my computer doesn't reconise the card anymore!
It was working perfectly but out of the blue it stoped.
I trying everything, I changed the cable, changed computer.
The PWR Led turns on, the RX/TX Leds flicker shortly and my program seems to boot. But the board is no longer found by my computer (Win7). =(
I just had this problem but with XP.
I fixed it by disabling then enabling COM3 from the device manager.
In case that makes no sense, here is a walkthrough :
Go to Windows Control Panel -> System -> (Hardware Tab) Device Manager
Scroll down to and open the Ports tab
Right click on COM3
Click DISABLE
Wait for the window to update
Right click on COM3
Click ENABLE
Quit the Arduino IDE and reload. It may have defaulted to COM1, so make sure you click on Tools -> Serial Port and select COM3 before trying to upload to your board.