Arduino uno with RX always on and doesn't connect to laptop

Hi,

I've upgraded my laptop from windows 7 to windows 8, and since then my Arduino Uno won't work. The RX Led is stuck on, and it isn't dettected in any laptop, neither with windows 7 nor windows 8. I tried reseting it, but I've got no feedback. I was working in a project that was reading encoders before, don't know if it's relevant.

Thanks in advance for any help.

http://arduino.cc/forum/index.php/topic,73748.0.html ...pass or fail?

[quote author=Coding Badly link=topic=150981.msg1134212#msg1134212 date=1361909563]

http://arduino.cc/forum/index.php/topic,73748.0.html ...pass or fail? [/quote]

Fail. The arduino uno isn't detected by any PC, so I can't test the serial port.

It’s possible the processor (the ATmega16U2 or ATmega8U2) used for USB-to-serial conversion is the only problem. Reflashing the firmware may bring the board back to life.

Do you mean reinstalling the bootloader? or another thing?

theriverramones: Do you mean reinstalling the bootloader?

No.

or another thing?

https://www.google.com/search?q=arduino+atmega16u2+firmware

[quote author=Coding Badly link=topic=150981.msg1141703#msg1141703 date=1362357371]

theriverramones: Do you mean reinstalling the bootloader?

No.

or another thing?

https://www.google.com/search?q=arduino+atmega16u2+firmware [/quote]

I've tried it, but I've got and error message that says that "could not open USB".

https://www.google.com/search?q=arduino+atmega16u2+firmware: About 14,800 results

...from that query.

theriverramones: I've tried it...

Of the 14,800, which did you try?

[quote author=Coding Badly link=topic=150981.msg1146355#msg1146355 date=1362648503]

https://www.google.com/search?q=arduino+atmega16u2+firmware: About 14,800 results

...from that query.

theriverramones: I've tried it...

Of the 14,800, which did you try?

[/quote]

http://arduino.cc/en/Hacking/DFUProgramming8U2

I've tried this one. I've been using Atmel flip program, but it won't dettect the board

The other method is re-flashing the firmware using in-circuit serial programming (aka ISP or ICSP; Atmel uses ISP).

This appears to be a good overview of the process... http://arduino.cc/forum/index.php/topic,132310.msg1087673.html#msg1087673

I found that thread with this search... https://www.google.com/search?q=arduino+uno+atmega16u2+firmware+isp+icsp