How to resolve boot error when player startup?

It may occur because of the following:

• The memory was not formatted properly.
• The memory was formatted on a computer.

Follow the instructions below to format the memory.
Press button, then Format OK appears. Select OK to press button to confirm. FORMATTING... appears and formatting starts. When formatting is completed, COMPLETE appears.

Note:
All data (songs, including sample data installed at the factory, bundled software installer, and the Operation Guide) will be erased after formatting. If formatting does not solve your problem, consult your nearest Sony dealer.