Check the following.
- The remaining battery power may be insufficient. Charge the battery by connecting the player to the computer.
When you use your WALKMAN for the first time, or if you have not used your WALKMAN for a long time, recharge it fully (until the OPR lamp turns off).
When your WALKMAN has been fully charged, disconnect it from the computer.
- Slide the POWER switch to the ON position to turn your WALKMAN on.
When paused, if there is no operation for about 30 minutes, your WALKMAN" automatically enters standby mode. In standby mode, press the @(PLAY/PAUSE) button to resume playback of music or slide the POWER switch to the OFF position and then back to ON to turn your WALKMAN on again.