My password only works to log into the computer, but not to make admin changes, even though I am the admin account on the computer.  This happened after I tried to change the computer's name. Is there any way to fix this?

Bought my laptop off my room mate and he had master reset it to default.  This still left his name as the computer name and I wanted to change that.  Tried to rename it under the advanced changes section, and now it isn't recognizing my password for anything more than logging in.  I can't unlock the settings to make further changes (or change it back).  I have had my room mate try all of his old passwords and usernames, to no avail.  Is there a way to reset this?  It's also not letting me wipe the drive and start fresh again because, alas, I don't have access without the password.  Any advice would be very helpful.  Thank you!

Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Click the Clear Display icon in the toolbar. Then try the action that you're having trouble with again. Select any messages that appear in the Console window. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message (command-V).
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Anonymize before posting.

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