Have tried a hard reset on the Sony?
From the Wiki:
Hard Reset (PRS-300)
WARNING: A HARD RESET WILL ERASE ALL CONTENT ON THE READER.
1. Power off the Reader.
2. On the bottom edge of the Reader, using a pin or paper clip, press the RESET button.
3. Turn on the Reader.
4. While the screen displays Opening book... , simultaneously press and hold down the down arrow of the directional button and the 0 button until the Reset All screen is displayed.
NOTE: If Opening book... does not display on the screen, charge the Reader's battery for several hours before
attempting the reset process again.
5. Press the 5 button to reset the Reader.
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