I have an Arduino Mega 2560 which was working just fine a few days ago. I've just been working with it and now it's not being recognised by any computer, not even as an un-recognised device.
The power LED lights up and the L led near the USB port flashes briefly, but apart from that nothing much happens. I think it runs the code that was on it before it stopped working too.
The question is, have I fried something on it (like the USB controller) and can it be repaired, or is there something else I need to try to fix it?
Best Answer
Even if the original USB-serial is bad (and can't simply be reflashed), if the main processor seems good you may have the option of communicating with it using an outboard USB-serial converter or level shifter (if you can still find a real serial port). For a plain arduino it would be barely worth it, for a mega with its substantially higher price it could well be worth the trouble.