find a bad connection, power down your computer before reattaching the device’s
serial connector, then restore power and allow the system to reinitialize. If the device is attached correctly to its proper serial port, the problem probably exists in the pointing device’s wiring. Remove the ball and upper housing to expose the PC board, then use your multimeter to check continuity across each wire in the connecting cable. Because you probably do not know which connector pins correspond
to which wires in the device, place one meter lead on a device wire and “ring-out” each connector pin until you find continuity. Once you find continuity, wiggle the cable to stimulate any possible intermittent wiring. Repair any intermittent or open wiring if you can, or simply replace the pointing device. Symptom 25-4. The mouse/trackball device driver fails to load The device driver is a short program that allows an application program to access information from a pointing device. Most computer users prefer to load their device drivers during system initialization by invoking the drivers in the CONFIG.SYS or AUTOEXEC.BAT files. Most drivers are written to check for the presence of their respective device first—if the expected
device does not respond, the driver will not be loaded into memory. Other drivers load blindly, regardless of whether the expected device is present or not. If the device driver fails to load during initialization, your pointing device might not have been detected. Power down your computer and check the connection of your pointing device. Ensure the device is securely plugged into the proper serial port (or other
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