Toshiba PORTEGE M400 - Manual (Page 201)

User’s Manual 9-16
Troubleshooting
Sound system
Refer also to documentation for your audio devices.
External monitor
Refer also to Chapter 8, Optional Devices , and to your monitor’s
documentation.
Problem Procedure
No sound is heard Adjust the volume control dial.
Check the software volume settings.
Make sure the headphone connection is secure.
If problems persist, contact your dealer.
Check Windows Device Manager. Make sure the
sound function is enabled and that settings for
I/O address, Interrupt level and DMA are correct
for your software and do not conflict with other
hardware devices that you may have connected
to the computer.
Annoying sound
is heard You may be experiencing feedback. Refer to
Sound System in Chapter 4, Operating Basics.
If problems persist, contact your dealer.
Problem Procedure
Monitor does not turn
on
Make sure that the external monitor’s power
switch is on. Confirm that the external monitor’s
power cable is plugged into a working power
outlet.
No display Try adjusting the contrast and brightness controls
on the external monitor.
Press hot keys Fn + F5 to change the display
priority and make sure it is not set for the internal
LCD.
Display error occurs Check that the cable connecting the external
monitor to the computer is attached firmly.
If problems persist, contact your dealer.