On the eve of your multi-year, multi-million dollar project going live, it is strongly suggested that you not change the god-level userid and password, reboot all machines, and then go home without first checking to see if everything still works.
If you persist in taking the approach mentioned above, then the next two hours of your miserable life will consist of troubleshooting the problem while simultaneously laughing, crying, updating your resume, cursing, clenching the ol’ sphincter tight enough to make a diamond, wishing you were dead, promising God you’ll get rid of all your porn if he just makes this work, and even more cursing before finally figuring out what you missed. One. Single. Unchanged. Userid.
If, however, you sound calm, cool, and collected on the phone while explaining the problem and resulting solution to the Project Director, PC/LAN Supervisor, and Project Technical Supervisor, you will be seen by them as a genius. Your peers, however, will know you almost fucked up big time.