Unix password

hi all
i have a unix machine that i have forgotten the root pass
am only able to log in as single user but cannot change the original pw
can anyone assist how i can change this?
Answer #1
Have a look here
http://www.unix.com/answers-frequently-asked-questions/14327-lost-root-password-cant-login-root.html
Answer #2
thnx for the forum
Answer #3
good luck
http://www.edcint.co.nz/misc/lostunixrootpassword.html