My playstation network account? help?

okay my other ps3 had a system failure boo hoo everything was ruined but i moved on and im buying another one but from my brother's friend. if i want to sign on to the playstation account i used for my broken ps3 onto the ps3 im about to buy will it work since someone else used it? lik will i have to deactivate any accounts or anything for games demos and video downloads?