Onscreen messages
As stated above,the computer will often display a mes-sage indicating what is wrong. Here is how interpret these messages:
1.Missing operating system- somehow the computer's operating system has become corrupted. This could have happened because of a virus, a hard drive malfunction, or a computer user error. You will need to contact a computer technician. When using macs, this type of error is indicated in any message containing"os."
2.Disk boot failure- this error usually signifies that the hard drive has either become disconnected from the motherboard or is damaged you will need to contact a computer technician when using macs,this type of error is apparent when the start up screen continually freezes or if a file folder with a blinking question mark appears.
3.Keyboard error or locked- your keyboard is not plugged in properly. Turn off the computer, remove the keyboard from your computer, and connect the keyboard properly to your computer. Check to make sure that it is in the proper port on the back of the system unit. When using macs,no error message will appear,the keyboard simply will not work.
4.Nonsystem disk or disk error- you have accidentally left a floppy disk in drive a. remove the disk from the drive and press any key on the keyboard. The computer will continue with the booting process .when using macs, you may get a similar message if a peripheral device is connected incorrectly. detach any new peripherals and restart.
Troubleshooting input devices
Input devices are devices that are connected to the computer and send data into the computer. Examples of input devices include keyboards and mice. Even though computer users rarely have problems with input devices, it is important to know how to troubleshoot them when they do happen, because you cannot operate a computer without certain key input devices such as a mouse and keyboard. Before you begin changing settings or installing and uninstalling drivers, there are some initial things that you can do:
1.Loose connections-check to see if the input device is connected properly and securely. A loose connection and a bump of the computer can cause the cable to disconnect and cause the device to stop working.
Computer viruses –check for viruses on the computer. You will need to run a virus scan using antivirus software.
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