For BCS and Bank Written Exam.

Lesson 4 : Checking Software and Symptoms 

4.1. Learning Objectives
On completion of this lesson you will be able to describe:
 Checking the software
 Checking external symptoms.

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4.2. Check the Software 

Most of the microcomputer problems are software problems. A separate book can be written on troubleshooting one software. (For example, Windows, NT, OS/2, LINUX etc.) Software problems have several causes: 

 Operator’s fault 

 Bug in the device driver 

 Bug in the software 

 Virus. 

4.2.1. Operator’s Fault Many problems are created only for the ignorance of the operator of how to use the computer. So when a program is not working, at first check if the operator uses the program in the proper way. 

4.2.2. Bug in the Device Driver 

Device driver is the software that is used to drive specific device. They support the operating system. If the device driver has a bug or not installed properly, then it will not do its job correctly. For example, in Windows 98 environment the device driver for printer ‘HP LaserJet 4L’ drives the ‘HP LaserJet 4L’ printer. When any application wants to print a document: 

 The application supplies printing request to the Windows 98. 

 If the attached printer is ‘HP LaserJet 4L’, Windows 98 delivers the printing request to the device driver software for ‘HP LaserJet 4L’. 

 The device driver performs most of controlling of the ‘HP LaserJet 4L’ printer and delivers the printing request to the printer.

 The printer prints the document as ordered by the device driver.

If there is a bug in the device driver for ‘HP LaserJet 4L’ or it is not installed properly then it will not be able to print the document. Just reinstalling solves most of the device driver problems.