How to create/reset root password on OSX Yosemite

Hi,
I am currently a standard user on a late 2008 Macbook Pro. There are two users on my computer, mine and another admin account. I do not know the password to the admin account. Before I upgraded to OSX Yosemite I had created a root user password in SUM using the command "passwd". After I upgraded (I reset my computer) I was back at square one, me as a standard user and another admin account that I didn't know the password. After I upgraded the “passwd” command didn’t work.
I tried to obtain the root password using multiple SUM commands like, "rm /var/db/ .AppleSetupDone" which didn't work because it said that it couldn't find the file. Then I tried to use the command, “/System/Library/LaunchDaemons/com.apple.opendirectoryd.plist” and then entering “passwd”. However that didn’t work. (Everything I did was after I mounted the drive.)
So I was wondering if anyone on the forums knew of a way for a standard user to reset the root password without the knowledge of the admin password.
Thanks in advance.

Hey SamuraiPizzzaCat,
Thanks for the question. After reviewing your post, it sounds like you want to use automatic login. I would recommend that you read this article, it may be able to help you resolve or isolate the issue.
OS X Yosemite: Login Options pane of Users & Groups preferences
Automatic login
Choose Off to require users to log in whenever the Mac restarts.
To automatically log in a particular user when the Mac restarts, choose the user’s account name and enter his or her password.
Thanks for using Apple Support Communities.
Have a nice day,
Mario

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