Apple Macintosh LC 630 DOS - Manual (Page 96)

If you are trying to use a DOS disk in the Macintosh environment, consider
the following:
m The disk may have been formatted incorrectly on a DOS computer (or in
the PC environment on your Macintosh). On DOS computers it’s possible
to format a standard double-sided disk in a high-density (1440K) format,
and vice versa. Disks formatted in this way cannot be read by a Macintosh
computer.
When formatting disks in the DOS environment for use in both the
Mac OS and DOS, always format standard double-sided disks in the 720K
format. Always format high-density disks in the 1440K format.
If a disk has been formatted incorrectly, switch to the PC environment and
copy the disk’s contents onto another disk that has been properly formatted.
The pointer ( 8 ) freezes on the screen.
Your system has a software problem.
m Press x-Option-Esc to quit the application program in use when the
problem occurred. If this works, you can save the documents open in other
programs before restarting.
m Restart your Macintosh. (For instructions, see “Start Over” in the section
“When You Run Into Trouble” earlier in this chapter.) Most software
problems are temporary, and restarting usually corrects the problem.
m Check the startup disk and program you were using when the problem
occurred. Make sure that all programs, desk accessories, and system
extensions you’re using are compatible with the system software.
m Sometimes incompatible system extensions or control panels can cause
system software problems. Restart while holding down the Shift key; this
temporarily turns off all system extensions. If your computer works
normally after you do this, remove all extensions from the Extensions
folder (inside the System Folder) and put them back into the Extensions
folder one at a time. Restart after you add each extension. This procedure
should identify any incompatible extensions.
You can also use the Extensions Manager control panel to turn off
individual extensions. For information on using this control panel to
manage system extensions, see the “Setting Options” topic of Macintosh
Guide, available in the Guide (h) menu.
85 Troubleshooting in the Macintosh Environment