Check Primary Net & Printer keeps printing pages with nothing on them

Having 3 issues...

I just purchased the Xerox Phaser 6510.  On the display it says Ready "Check Primary Net."  I'm plugged into the computer by USB.  Should I unplug?

Second issue...

Whenever I hit print, it just keeps printing blank pages .  One or two come out with a bunch of numbers or a message that says "ERROR: undefined OFFENDING COMMAND: - oPERAND sTACK: -3.84 -1.12.  I have no clue what this is.  Did I install properly?

And last - I'm printing on labels for laser printers and sometimes the black comes out with patches of white.  Not sure what this is about.  

HELP!

Thanks so much!