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3.4. Check if all the Devices are Plugged Correctly 

Many problems are happened because of improper connection. Improper connection means: 

 A connection is not done. 

 A connection is done but it becomes loose. 

 A connection is done and it is not loose but it is done in wrong direction. So, check if all the 

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external connections are plugged tightly with proper direction. 

One day I found that a PC was not working though it was working little moment before. I checked all the connections and they were plugged `properly. AT last I found that the PC is plugged in the voltage stabilizer and the stabilizer is connected in the wall socket properly but the stabilizer is off. 

3.5. Check if any New Change is Done If the PC was working properly before some time and now it is making trouble, then check if any change has been made between this period. This change may be responsible for the problem. So undoing the change will remove the problem. For example, some early PC programs like ‘Infocom’ games do not run in more than 512K RAM. If you add some RAM after 512KB then Infocom game will prompt “Illegal operation” and reboot the PC. From this prompt it is not possible for you to find out the fault. By ‘checking if any new thing is done’ you will find that before adding the RAM the game was working properly, but after adding it fails. So the problem is in RAM addition. To ‘check if any new thing is done’ you should check: 

 Any new hardware added 

 Any hardware setup changed 

 Any new software added 

 Any software setup changed.