Below is the hard reset procedure for the 300. Before doing the hard reset are you able to connect the Reader to your computer and view the ebooks from either Calibre of the Sony Library software? Try to first remove the titles you copied to the Reader before the problem started. Then see if this fixes the problem.
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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