Two possible problems:
1. Bad formatter, not liklely if you have used this printer with this jet direct card for a while and have not removed the card from the printer.
2. More likely either bad or in need of reset jet direct card. I am going out on a limb and guessing that you have a Jet Direct 615 card. There is a small chance that the card just needs to be reset. To do this you must perform a cold reset of the printer. Any custom tray settings that you have made will be lost during this process as will any network settings. To cold reset, turn printer off and unplug the network cable. Hold the "checkmark" key and power on the printer. Keep holding the key until all three leds turn on solid. Release the checkmark key and use the arrow keys until "COLD RESET" shows in the display. Press the checkmark key and until will perform a cold reset and restart. Plug your network cable back in and print a configuration page. If card is working again great, if not, it is likely that the card is dead and will require replacement.
If card does work, you will want to ensure that the Jet Direct card has current firmware on it. Use the HP Download Manager
to update the firmware on your Jet Direct card.