User guide

Matrox Graphics Card – User Guide 19
7 Under HKEY_LOCAL_MACHINE Æ SOFTWARE , remove all items starting with
“Matrox” or “MGA”.
8 Restart your computer, then install the latest display drivers for your Matrox graphics
card. You may also need to reinstall other Matrox software.
Problem After game for Windows 95/98 starts, monitor doesn’t display properly
(blank screen, rolling or overlapping screen images)
Cause
If your game uses a low-resolution (640 × 480 and below), full-screen display mode, your
monitor may not support the refresh rate the Matrox driver is using.
Solution 1 If the game is still running in full-screen mode, press [Ctrl]+[Alt]+[Del] once for the
Close Program dialog box, and then click the End Task button.
2 Access the Matrox PowerDesk Monitor Settings property sheet (see “Accessing
PowerDesk property sheets”, page 8).
3 Click Select customizations from the Matrox list .
4 From the Matrox monitor list, select the monitor model you’re using. If your monitor
model doesn’t appear in the list, select a monitor that runs at 60 Hz at 640 × 480 (for
example,
Standard monitor types Æ Vesa 1024X768 @60Hz Æ Next ). Follow the on-
screen instructions to complete the selection.
Problem Matrox Diagnostic or setup program reports an IRQ problem
(3D and video programs don’t work)
Cause
Your computer or program may not work well with bus mastering.
Solution Disable bus mastering. (If you want to continue using bus mastering, see the other solutions.)
Windows 95/98 –
1 Access the Matrox PowerDesk Options property sheet (see “Accessing PowerDesk
property sheets”, page 8).
2 Clear the Use bus mastering check box.
3 Click OK Æ OK Æ Yes to accept the changes and restart your computer.
Note: Recent versions of Matrox PowerDesk for Windows 95/98 (5. x and later) store
registry settings under
HKEY_CURRENT_USER Æ SOFTWARE . Your settings under
HKEY_CURRENT_USER are only accessible if you’re logged into Windows with your
user name.
9x9x
9x9x