Apple 190 series manual Diagnostic Techniques, Checking your system software extensions

Consult this chapter before you call the Apple Assistance Center to solve problems with system software and your hard disk.

8 Diagnostic Techniques

This chapter provides a step-by-step approach to diagnosing and solving system software and hard disk problems. Try the steps listed in each section in the order they are given until you can identify and solve the problem.

Checking your system software extensions

System software extensions are files that add features to your system software. Some extensions are incompatible with one another or with certain programs. To check whether an extension is causing problems, follow these steps:

1Start up the Macintosh PowerBook while holding down the Shift key. Keep it held down until you see the message “Extensions off” in the Welcome to Macintosh box.

This procedure turns off extensions.

If this procedure solves your problem, then continue with this section. If not, then turn to the next section, “Testing Your Hard Disk.”

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