
Ok so I bought a macbook off the internet from some guy and I wanted to change all the passwords and stuff so my girlfriend has the macbook as well I took her Install CDs 1 & 2 and I held C down and changed the passwords than for some reason I completely blanked on the password I made my hint the password and it still shows up but when I type it all it does is shake the login box over and over

... I put the CD in again and held down C now this time it wont let the computer boot from the CD it goes directly to the logon screen!! I dont care I will restore the entire thing because I dont even know whats on it might as well start fresh I have had the computer for like 4 weeks now just sitting around... Can anyone help me out here!!!???