So yesterday I upgraded my MacBook pro from snow leopard to lion. I was playing around with the settings and I do remember changing my admin password but I now forgot it and I've locked myself out of my own Mac! I've typed in every possible password I use but nothing works. I don't know if this makes a difference but I also did link my apple Id account to my Mac. Anyway, I'm locked out and don't know how to get back in. What other options do I have? I would of done another install of lion but I don't have the disc as al you guys know. And also, I've backed up all my files already. I dont have apple care so I doubt taking it to them will help?