sounds like a hardware issue... (bad news)

but try safe mode...

hold right direction and power on...

if it works re-flash it... best of luck

Hello,

    Let's try this.  Power the unit on, then hold the "outputs" button for four seconds.  Then hit the "down arrow" on the four-way key three times.  use the first black knob from the left (under the display) and turn left/right to see if there is any change in the contrast.

    You can also try reflashing the unit using Line 6 Monkey.  Please see the following links for more information:

  Line 6 Monkey Installation and F.A.Q.

  http://line6.com/community/docs/DOC-3898

  POD X3 Series: Factory Reset, Reflash, and Firmware Updates

  http://line6.com/community/docs/DOC-4698

    If you are still having problems you should contact the seller and discuss the situation with her/her.