PowerBook 160/180: Problems Using an External Monitor

I have problems when my startup screen and menu bar are located on an external monitor connected to my PowerBook 160 or 180 computer with System 7.1. When I try to shut down, the computer will display either a "Finder - Illegal F-line instruction" or "Finder - error type 41" error. The System Updates (2.0.1 and 3.0) do not seem to help this problem. Can you help?
You will get this error on a PowerBook 160 or 180 with System 7.1.x when you connect an external monitor, multiple ADB devices, and both the menu bar and the startup screen are moved to the external monitor.

It will only occur if:

1) multiple ADB devices (the Apple Adjustable Keyboard acts like multiple devices) are attached

-AND-

2) both the menu bar and the startup screen are placed on the external monitor.

It does not occur with the PowerBook 165c or PowerBook 180c. It also does not occur with the PowerBook 500 Series computers.

Two temporary workarounds are to either:
- not use multiple ADB devices
- not put both the menu bar and the startup screen on the external monitor.

The permanent fix is to update to System 7.5.x or newer.
Published Date: Feb 19, 2012