Can't access anything on my Imac!
I had my main account on my Imac, and now its goen only "Guest" account appears and when I click on it I can't use any programs not even system preferences to change it, because its blocked and says I need the administrator user name and password, but everytime I type my username and password the computer doesn't recognize me anymore. Please help me out.
iMac, Mac OS X (10.6.6)