uno not working issue

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.