Installation guide

Matrox Graphics Card – Installation Guide 15
Cause
(PCI graphics cards only) Your Matrox card may be in a “slave” expansion slot on a
computer that makes a distinction between bus mastering and slave slots.
Solution
Change slots. Shut down your computer, disconnect it from the power supply,
remove your Matrox card and then insert it into a different PCI expansion slot. For instructions
on how to safely install your Matrox card, see “Hardware installation”, page 5.
Cause
Your computer may have not given an interrupt request (IRQ) to your Matrox graphics card
or may have given one used by another device in your computer. This may be because your
computer’s “Plug-and-Play” feature is turned off.
To check the display adapter’s IRQ (Windows 95):
1 Right-click the My Computer icon on the Windows desktop background, then click the Properties
menu item
 Device Manager tab.
2 Click the plus sign to the left of the Display adapters. An “X”
through an icon means the hardware has been disabled. A
circled exclamation point through the icon means the
hardware has a problem.
3 Double-click the name of your Matrox display adapter to open a properties dialog box. The type
of problem is displayed in the
General tab  Device Status area. Check also the Resource tab 
Resource Settings list for an Interrupt Request.
Solution
Change settings in your computer’s CMOS setup utility.
If your computer has the options of enabling Plug-and-Play detection, or assigning an IRQ to a
VGA adapter, make sure they’re enabled. If your computer doesn’t have these options, you may
be able to manually assign an IRQ to your graphics card using the CMOS setup utility.
For more information on your computer’s CMOS setup utility, see your system manual or contact
your system manufacturer.
Solution
Windows 95 (PCI graphics cards only): You may have to manually assign an IRQ
to your Matrox card with the irqset program in the C:\Program Files\Matrox MGA PowerDesk
folder. For instructions on how to use irqset, see
 Programs  MGA PowerDesk 
readme.
Cause
Your computer’s other BIOS settings may be incorrect.
Solution
Reset your computer’s BIOS settings to the factory defaults using the CMOS setup
utility. The factory defaults are usually the “safest” settings. Check your system manual for more
information.
eng_inst.print.book Page 15 Tuesday, February 17, 1998 4:39 PM