How make reset factory dell 3110
For the 3100cn, once the web password has been set, you need to do a deep NVRAM reset to clear it.
Before doing anything, print a Printer Settings page so you know what your printer settings are, espcially page count. I might advise dating and saving this for possible future reference
Here's how to deep reset NVram for the 3000/3010/3100cn printers:
1. Pwr Off
2. Hold the Left + Right + Menu buttons while you Pwr-on (release them when display = DIAGNOSING...)
3. At the PASSWORD prompt, press UP, UP, [enter] (enter=center button)
4. Down button to INSTALLATION SET; [enter]
5. Down button to NVM Init; [enter]
6. OK?, [enter]
7. After completion message, Pwr off, wait 5 secs, then pwr on
After pwr on, the LCD displays "Init NVram" & "Initializing", then completes POST with "Diagnosing".
After printer completes POST, the toner level indicators on the LCD may show empty. The printer will need to be Pwr'd Off/On once again to correct display.
The procedure for the 3110cn is nearly identical. Let me know if you have problems figuring it out.