I've been using my 2014 Macbook Air for a couple of years. It was purchased new from the local Best Buy store. (still have original receipt) I don't remember if I created a password for the MBA when I unboxed it. At that time, I had just switched from Windows to Mac OS and it was my very first Mac. Last week, I bought a new printer and downloaded the printer software from the manufacturer. Unfortunately, the MBA would not allow it to be installed because it's not from an approved list or manufacturers or something. It said I had to change my security setting for it to be installed. The problem is that it's asking me for my MBA's password. I tried my Apple ID password and every password that I have ever used in the last several years(as well as variations of them). I am the only person using this MBA and I have never lent it to anybody. I tried reading about this password issue online but can't figure out which one will actually help me figure out what the password is.(or to reset or create a new one from scratch) Can anyone help me with this? Thanks in advance!