My uno tx rx light will not blink!
Just yesterday, I tried connecting my uno to the comp and there is no tx rx light! Anyone know what went wrong? How can I troubleshoot to know if i kill some chip or something?
Did you remember to change the board type?
It sounds like it was detecting it before but saying it was in use, now you say it is not even detecting it. It sounds like either the board or the drivers are screwed. I think XP requires drivers even with the UNO so you could try un installing them and then reinstalling them again.