Lenovo 4157, 4105, 4217 manual Troubleshooting and diagnostics, Basic troubleshooting

Chapter 8. Troubleshooting and diagnostics

This chapter describes some basic troubleshooting and diagnostic programs. If your computer problem is not described here, see Chapter 10 “Getting information, help, and service” on page 39 for additional troubleshooting resources.

Basic troubleshooting

The following table provides information to help you troubleshoot your computer problem.

Symptom	Action
The computer does not start	Verify that:
when you press the power	• The power cord is plugged into the rear of the computer and into a working
button.
	electrical outlet.
	• If your computer has a secondary power switch on the back of the computer,
	make sure that it is switched on.
	• The power indicator on the front of the computer is on.
	If you cannot correct the problem, have the computer serviced. Refer to the safety
	and warranty information that is provided with your computer for a list of service
	and support telephone numbers.
The monitor screen is blank.	Verify that:
	• The monitor cable is securely attached to the rear of the monitor and to the
	rear of the computer.
	• The monitor power cord is plugged into the monitor and into a working electrical
	outlet.
	• The monitor is turned on and the brightness and contrast controls are set
	correctly.
	• The monitor signal cable is securely connected to the monitor and to the monitor
	connector on the computer.
	If you cannot correct the problem, have the computer serviced. Refer to the safety
	and warranty information that is provided with your computer for a list of service
	and support telephone numbers.
The keyboard does not work.	Verify that:
The computer does not respond
to the keyboard.	• The computer is turned on.
	• The monitor is turned on and the brightness and contrast controls are set
	correctly.
	• The keyboard is securely connected to the keyboard connector on the computer.
	• No keys are stuck.
	If you cannot correct the problem, have the computer serviced. Refer to the safety
	and warranty information that is provided with your computer for a list of service
	and support telephone numbers.

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