By pressing '1' repeatedly during boot with a Region-2 DVD will allow the PD-510 to play. After that the buttons on the player AND the remote are useless until you eject the disc.
Wrong region also shows in the top left corner of the screen, to remove this move the PAL/NTSC switch to PAL and back to NTSC and it goes away, now all that is left is a stop sign in the top right corner.
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