Arduino Uno recently unrecognized

Development Tools IDE 1.x
1

Hello,

My os is : win7.
I've an arduino uno board.
I used it with a protoshield and a motor controller, I uploaded a code on it, worked prefectly.
Recently, I tried to connect it to my computer : unrecognized, no serial port appeared. I didn't do anything on the board and it's still working with my circuit but I can no more interact with a pc.

The only changment I can see is that the L led is constantly on, not blinking.
If I try to reset the board, the Led goes off and then back constantly on.

I haven't installed anything new. My computer still recognize an Arduino Duelmilanove ATmega 328 board and I can still upload on it.

Thanks for your concern and help.

2

Did you try uploading with nothing connected to the board?

3

Indeed, at least (since my comp doesn't recognize the board) I try to plug it in, in a USB port, without any success of recognition ...

Thanks for your concern and help.