Xerox Phaser 6300 does not print, display panel does not work
I have a Xerox Phaser 6300 that does not print. The display panel does not work. We have a 6350 that does the same thing. These printers used to be connected to a network. I have had the 6300 in my office for 3 years. It is connected to my Dell Optiplex 990 only, which is new as of about 2 months ago. The 6300 has worked most of the time for 3 years, but sometimes it doesn't. It worked 3 days ago, once, and now it doesn't. Hot and cold like that. Any ideas.