Hi, I just downloaded Yosimite. It really took awhile with my internet connection. I had not updated since OS X 10.6.8 I had started to think that my computer had started to fall apart in the inside. However, the Wifi failing and other problems, may be due to having a problem with the 'system's password'. I have been required in the last month and half to give a password, (the password one is required to update the OS X). The password I thought I had always used is not working. How could create a new password or retrieve one? Thank you, kind regards, igmolinav : ) !!!