Press & hold 2 & 8 while powering on in order to enter service mode on the Xerox 6605.
This KB article should have the directions you need.
**Please note, this will reset any network settings you have set on the device.
Hope this helps.
I have a Workcentre 6605N I'm unable to login on the web interface since we forgot the user name and password we setup when we installed the machine. Is there a way to reset the passord so we can manage the machine from the web?