Hello all, this is a strange first post and I hope someone may be able to offer some insight. I recently received my Leonardo and I am completely new to embedded systems and microcontroller use/programming. On to the issue!
My Leonardo was functional for two days, no issues. Then one day I plugged into the USB port I always used (COM3) and uploaded a sketch. I received an error stating that COM3 was already in use. I then opened my Device Manager and noticed that the 'Ports' option was not there despite that the Leo was plugged in. I unplugged it and plugged it back in and the it showed briefly on COM4, the disappeared altogether again. I have another Leo which I tried and it worked perfect!
I'm wondering, could my sketch have stuck my board? I've seen mention of a DFU to hard reset the board but can't find Leo specific instructions. In the event it helps my OS is Windows 7 Home. Any insight or thoughts are most welcome! Thank you!