The networking software may have been corrupted. This problem could occur on any PowerBook 500 series computer or any other Macintosh computer. If EtherTalk cannot be turned on, then reinstall the System 7.5 Networking software using the following steps. First Custom Remove the Networking Software then Custom Install it.
Test the Hard Drive
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1) Shut down your computer.
2) Insert the Disk Tools disk into the floppy drive and turn on your
computer.
3) Double-click on the Disk Tools disk icon on the desktop to open it.
4) Double-click on the Disk First Aid icon.
5) Select the Hard Drive icon.
6) Click Verify and follow the instructions on the screen.
7) When you are finished, click Quit.
8) Double-click on the Apple HD SC Setup icon.
9) Click Update and follow the instructions on the screen.
10) When you are finished, click Quit.
Reinstall the Networking Software
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1) Shut down you computer.
2) Insert the Install 1 disk into the floppy drive and turn on your
computer.
3) Double-click on the Install 1 disk icon on the desktop to open it.
4) Launch the Installer by Double-clicking on its icon.
5) When you see the Installer's welcome screen click Continue.
6) Make sure the Destination Disk indicated on the screen is the one on
which you want to install system software.
7) Click on the pop-up menu in the upper left corner of the installation
window that says Easy Install on it. Pull down the menu and select
Custom Remove.
8) Click to put an x in the Networking Software box.
9) Click Remove and follow instructions on the screen.
10) When Removal is complete. Choose Continue for further installation.
11) Click on the pop-up menu in the upper left corner of the installation
window that says Custom Remove on it. Pull down the menu and select
Custom Install.
12) Click to put an x in the Network Software box.
13) Select Install and follow directions.
14) When you are finished, click Quit and Restart.
You should now be able to switch from LocalTalk to EtherTalk in the Network Control Panel.
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