Hello. I had a sketch programmed and was working . l tried some other things with it and came back to my original project and nothing works now. The Green power led is on but nothing works restart will not work . anything I can do??? Thanks J
Yes, you can stop the hand-waving, and inform us.
Give a decent description of the symptoms.
Does the IDE load? Can't you compile? Can't you upload? Something else? Does a simple example sketch work?
Which OS, which IDE version?
Do you have boards hooked up to your Arduino? Remove it all and try again.