Lost Admin Logon and Password
So I am a Windows guy and I took over internal IT support for a small company. The previous administrator became very ill and is now gone. Unfortunately no one knows the logon user name and password. I've tried hundreds of ideas based on what I knew about the previous admin with no luck. This is a Linux Red Hat Enterprise 5.0 system. I really don't want to wipe and reload until I figure out what is going on with this server. Any ideas?? I am not a Linux guy but I learn very fast.