This is a wierd issue. Do you have any other HP printers using Toolbox installed? My only tips is to do a cold reset on the printer to get the printer back to factory defaults.
Cold reset:
1. Turn the printer off.
2. Press and hold down the green GO button.
3. Turn the printer on and continue to hold the green GO button for at least 5 seconds, but not longer than 15 seconds. During the process, the Attention LED will turn on.
4. Release the GO button.
NOTE: If both the Attention light and the Ready LEDs turn on before the GO button is released, the cold reset procedure must be started over at step 1.
5. The printer LEDs begin cycling. The cold reset process runs until completion and the printer returns to the Ready state.