Epson PowerLite 470 Operation Manual page 47

Troubleshooting
Error Messages
To output audio from the projector, restart applications
such as PowerPoint or Windows Media Player.
You need to restart your computer to enable Audio
Output. Select "Yes" to restart now or select "No" to restart
later.
Cannot start this application while Quick Wireless
Connection is running.
The wireless LAN is off. Turn on the wireless LAN, and then
try searching again.
After restarting PowerPoint or Windows Media Player, audio is output from the projector.
To transfer audio to the projector and play back, select Yes and restart the computer.
Close Quick Wireless Connection and then start EasyMP Network Projection.
Turn on the computer's wireless LAN, and then try searching again.
Remedy
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