Make sure the volume is not set to zero. Try raising the volume
using the volume buttons located on the front of the PSP®
(PlayStation® Portable) system.

Make sure the mute setting is not on. Press the
located on the front of the PSP® to clear the mute setting.

If headphones are inserted, the PSP® will not send any sound
through the speakers. To check that the speakers work, unplug the
headphones.