So I bought a used ps3, but it will not let me make a new PSN.?

May be...

It says that it has already reached the limit for accounts allowed!! Is there other anyway to get a PSN? If not, can someone here make me one? I just want to play Madden online!

You can have tons of accounts on there. anyways just format the hard drive to get rid of everything on there. Then delete all the accounts. Then it will be like brand new (sort of) then create your account. Be sure to register all your equipment online at playstation3.com to be considered for all betas. good luck to you.

Return it and get another one.

Because maybe the guy that used it has used up all the accounts he's allowed.

delete some of the users then create a new one

hope it helps :)

yea u can try formatting it