User guide

62 Matrox Marvel – User Guide
5
Cause
If you’re using a program that runs full-screen, this program may be using a display mode
that’s not supported for TV output.
1
Solution
If the program offers a choice of display modes, select a display mode supported for TV
output. For a list of display modes supported for TV output, see “Supported TV output
modes”, page 70. For information on how to change display modes with the program you’re
using, see its documentation.
2
Solution
View the program you’re using with your computer monitor instead of your TV.
Problem Computer monitor becomes garbled or unusable while in TV output mode
1
Cause
While in TV output mode, your computer monitor may also use TV settings. Some computer
monitors may not support certain TV settings. The 50 Hz vertical refresh rate used with
European TV settings is particularly a problem with some computer monitors. See “TV
output setup”, page 23.
1
Solution
Windows 95/98 – To avoid using TV settings with your computer monitor, enable the Keep
optimal refresh when possible
check box on the DualHead Clone Options dialog box. To do
this:
1 Access the Matrox PowerDesk DualHead property sheet (see “Accessing PowerDesk
property sheets”, page 21).
2 Click Clone Options .
3 Enable the Keep optimal refresh when possible check box.
For more information, see context-sensitive help.
2
Solution
Turn off your computer monitor and use your TV to view your computer display. Your
computer monitor will work normally when TV output mode is disabled.
Note: Your Matrox graphics card may be configured to automatically use TV settings while
certain DOS display modes are used. For more information, see the
Readme file included
with your
Matrox System Utilities software.
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