From Experts-Exchange - http://www.experts-exchange.com/Hardware/Peripherals/Q_23547410.html
try this

Turn the printer off using the power button located on the right side of the unit.
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2. With the printer off, press and hold the Center and Right Arrow buttons of the Navigator Button on the front of the printer. While holding down both buttons, turn the printer on. 3. Continue to hold the buttons as the printer powers on. There will be dots (....................) going across the front of the printer display. The display of dots will repeat twice. 4. You can release the Center and Right Arrow buttons when the memory count is displayed. The printer will boot into Configuration Mode. 5. Press the Down button six times until you see Factory Defaults. 6. Press the Select button to select Factory Defaults. 7. Press the Down button once to highlight Restore Network. 8. Press the Select button to restore the network settings to default. The printer screen will display Restoring Factory Defaults and then Resetting Printer. 9. The printer will reboot with default network settings
Feb 21, 2015 Multifunction Color Laser Printer 3115cn Install Windows 8 to printer. You will need the “Login Name” of the user. IP address of the Dell 3115cn Network printer/scanner/fax This can be obtained by printing a configuration report. Dell™ Multifunction Color Laser Printer 3115cn User's Guide Manual - Free ebook download as PDF File (.pdf), Text File (.txt) or read book online for free. Dell only provides this manual as a Microsoft Help File and even the link for that doesn't show up in search engines, so I've converted it to PDF and made it easier to find. View and Download Dell 3115cn Color Laser Printer user manual online. Dell 3115cn User's Guide. 3115cn Color Laser Printer All in One Printer pdf manual download.
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- Search Dell 3115cn Color Laser Printer Documentation Find articles, manuals and more to help support your product. What can we help you to find. Submit Search. Top Solutions Manuals and Documents Regulatory Information Videos Top Solutions. The most helpful knowledge articles for your product are included in this section.
- Get drivers and downloads for your Dell Dell 3115cn Color Laser Printer. Download and install the latest drivers, firmware and software.
- Dell Mfp 3115cn User Guide Connect a USB cable from the Dell MFP Laser 3115cn to your computer. More info can be found in the 3110cn User's Guide or the 3115cn User's Guide. Dell™ Multifunction Color Laser Printer 3115cn User's Guide Notes, Notices, Dell MFP Laser 3115cn IP Address: Location: Displays the printer product name.
- This is a multifunction, hence the term MFP. It's a color laser printer that scans, prints, copies, and faxes. Like other mid-range all-in-ones, the Dell 3115cn does what you ask it to, and is more than adequate for a small to mid-size office with fewer than 10 users.