This is a repost of the content first published in August 2012, the original post was not readable on mobile devices but is still searched for on Google so we have re-created it.
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We encountered a Brother HL-5350DN printer today with no user display, after resetting the device to factory settings
Power off the printer
Hold the GO button while powering on the printer
All LED's will light up, keep holding
When the Status LED goes out release the GO button
Press GO 6 times
We needed to use the web interface to set the IP address, the access details are below
Username = admin
Password = access