There are some brief instructions for this procedure attached to the printer. The purpose of this procedure is to flush the binary data from the printers memory. The other required step is that the offending print job must be stopped, this is best done by the person who submitted the job. Once you are certain that the offending job has been removed and that the printer memory has been cleared then put the printer back on the network. Some idiot has been away for 2 days having left the screen in locked state, thus preventing other users from using the console.
Root can use the root passwd to get in unless xlock was used to lock the screen.
To make sure you do not do this by accident, follow these pictorial guidelines no Lock . If you cannot find the solution to your problem here and you have made other reasonable attempts to solve it, fill out a problem report.