Sony MZ-DH10P Operating Instructions Manual page 56

Symptom
You cannot operate the player.
You cannot transfer audio data
when pushing DOWNLOAD.
The lid does not open.
You cannot copy still images.
56
Case and/or corrective action
 You cannot operate the player while the player is connected to
the computer.
 The player is not correctly connected to your computer.
Connect the player and your computer correctly using the USB
cable.
 Audio CD is not inserted in CD drive of your computer. Insert
Audio CD.
 The capacity of the disc is insufficient. Insert another disc.
 It happens if you disconnect the dedicated USB cable in the
middle of a data transfer, recording, or editing operation on the
computer, but while the rechargeable battery is missing from
the player or is drained. Reconnect the dedicated USB cable or
insert a fully charged rechargeable battery into the player, and
then press  .
 The player is not correctly connected to your computer.
Connect the player and your computer correctly using the USB
cable (  page 47).
 You are not using the correct copy procedure for your OS.
Follow the designated copy procedure for your OS (  page
49).