I've a problem with my arduino mega:
Today I could upload programms and so on, everything worked fine. But now the arduino is not even detected by windows.
I checked the cable, tried an other one. Tried other computers - but it didn't help.
The power light is on, when I press the reset button or connect reset to ground the "L"-led is blinking.
The last thing I did with the arduino was testing an IR-sensor by Sharp.
Has anyone ever experienced this? Is there a way to solve the problem or is the arduino damaged?
edit: tried the loopback-test ( http://arduino.cc/forum/index.php/topic,73748.0.html
) , I'm failing at number 5. Windows does not recognize the board!