Apple Macintosh PowerBook 1400 - Manual (Page 116)

Follow these steps to reset the PRAM and NVRAM:
1. Shut down your computer.
2. Make sure the Caps Lock key is not engaged.
3. Position the fingers of your left hand on these keys: Command (
x),
Option, and R. Locate the P key, so you can find it quickly for step 4.
4. Press the Power key (marked with “on/off”) to turn on your computer.
Immediately after you hear the startup sound, press and hold down the
Command (x), Option, and R keys at the same time as you press and
hold down the P key.
5. When you hear the startup sound repeat twice, release the keys, then
immediately press and hold down the Shift key to start up with your
extensions turned off. Release the Shift key when you see the message
“Extensions Disabled” during startup.
If you don’t see the “Extensions Disabled” message, wait until startup is
complete, then press and hold down the Shift key while you choose
Restart from the Special menu. Continue to hold down the Shift key
until the message appears.
6. Open the System Folder, then open the Preferences folder.
7. Drag the Display Preferences icon to the Trash.
8. Restart your computer without holding down the Shift key.
The computer starts up with your extensions turned on again.
If the problem does not recur, it may involve the disk cache, virtual
memory, or file sharing. You may be able to fix the problem by making
the disk cache smaller or using a smaller amount of virtual memory. If
the problem involves file sharing, contact your network administrator to
make sure there are no network problems.
116 Chapter 7