7.If you are running an application program, see if you need to set up the program for the type of monitor and display adapter you have. Also make sure you are using the appropriate monitor and display adapter for your software.

Note

If your application program requires a monitor that supports graphics but you have a monochrome monitor, the results will be unpredictable.

8.If you installed a non-EGA or non-VGA display adapter card in your computer, and you want to use that adapter as your primary display adapter, you need to change the setting of jumper J6 on the main system board to disable the built- in VGA adapter. If you have not set the jumper, you will not see any display on the screen.

If you are using one or more MDA, Hercules, or CGA display adapter cards, you may need to change the setting of jumper J4 inside your computer. This jumper tells the computer whether you are using a color or monochrome monitor. (Jumper J4 is set to the color monitor position at the factory.) If the jumper is set incorrectly, you will see one of the following messages:

401CRT ERROR

501CRT ERROR

If you are using two different types of video cards, set jumper J4 to the primary monitor type. You may also need to change this jumper later if you change the type of monitor you are using. See “Changing the Jumper Settings” in Chapter 5 for instructions.

Troubleshooting D-15