Arduino Uno complete reset

Hi,

Hoping someone can help -
Something is wrong with one of my uno (I last used it 2 years ago and I have no recollection of what I did to it) & I've run out of options.
When I press the reset button on the board, nothing flickers, the green ON light is always constantly on.

Is there a lower level hard reset on this board or is it time to declare it a gonner?

thank you for any advice,

kat

If you can access a boot loader (from friend, or buy one--pretty cheap) and reinstall the basic data I would try that before throwing anything away.