Toshiba Satellite 1805 Series User Manual page 211

If you are using an external monitor:
Check that the monitor is turned on.
Check that the monitor's power cable is firmly plugged into a
working power outlet.
Check that the cable connecting the external monitor to the
computer is firmly attached.
Try adjusting the contrast and brightness controls on the
external monitor.
Press
Fn
priority is not set for the built-in screen.
The screen does not look right.
You can change the display settings by clicking a blank area of the
desktop with the secondary button, then clicking Properties. This
opens the Display Properties dialog box. The Appearance tab of
this dialog box allows you to choose the colors for the screen. The
Settings tab allows you to choose the screen resolution.
The built-in screen flickers.
Some flickering is a normal result of the way the screen produces
colors. To reduce the amount of flickering, try using fewer colors.
To change the number of colors displayed:
1 Point at the desktop and click with the secondary button.
2 Click Properties, and then Settings.
3 Change the Colors option and click OK.
For more information, see the Windows
A message indicates a problem with your display settings
and that the adapter type is incorrect or the current settings
do not work with your hardware.
Reduce the size of the color palette to one that is supported by the
computer's internal display. To change the display properties:
If Something Goes Wrong
Resolving a hardware conflict
and simultaneously to make sure the display
F5
®
XP Help.
211