root password

[Cole Mark A SSgt JTF-SWA/J6]

I am kinda new to linux and unix in general.  I inherited a linux box
without anyone knowing the root password or any accounts to log onto the box
with.  I have no idea what they were using it for (ok i lied...i think
mostly DNS).  Is there any way to get on and get/change the root password
without messing up the current "load".  I have no idea what flavor of linux
is on it either.  Thanks for any help/suggestions any may have!!

Mark Cole