I have had a imac/SG945AT2G42 donated to the Boys and Girls Club that I work at in Maryland. The person who donated the imac did not leave the operating disc or any information to contact them. I would like to get this updated and when I went to update it has a password. What I am looking for is a way to either get the os disc or a way to bypass the password. We have a new Imac flat screen that was donated las t year and I would like to show the children how the mac has evolved over the years. Thanks for any help in this matter