Apple Macintosh PowerBook 150 - Manual (Page 118)

m There may be a mechanical problem with the disk drive. If none of the
previous suggestions works, call Apple (see the service and support
information for the phone number), or take the computer to an Apple-
authorized service provider.
The hard disk keeps stopping and starting again.
m The hard disk may be going to sleep to conserve power. Open the
PowerBook control panel and move the Battery Conservation slider toward
Better Performance.
The icon of a floppy disk doesn’t appear on the screen.
m There may be a problem with the disk or disk drive. Try inserting a
different disk. If its icon does appear, the original disk is probably
damaged. You may be able to repair the disk or recover some of the
information on it. If the icon of the second disk does not appear either, the
problem is probably in the disk drive. Take the computer to an Apple-
authorized service provider for repair.
m Restart the computer, holding the Shift key down until you see the message
“Extensions off.” If this solves the problem, remove any control panels or
extensions you recently installed.
A high-density (1.4 MB) disk you use with your PowerBook computer is not recognized
by another Macintosh.
m Some disk drives cannot recognize high-density disks. Try inserting an
800K or 400K disk in the disk drive of the other Macintosh. If that works,
copy your files to an 800K or 400K disk. If you regularly plan to use
floppy disk drives of different types, use the lower-capacity disks in all
drives.
You can’t eject a disk from a floppy disk drive.
There may be a temporary mechanical problem with the disk drive. Try the
following solutions, in the order listed:
m Hold down the Command (x) and Shift keys while you press and release
the 1 key.
m Restart the computer and hold down one of the trackball buttons while the
computer starts up.
110 Chapter 9