Lenovo 8995, 6490, 9635 Troubleshooting and diagnostics, Basic troubleshooting, Symptom Action

Chapter 7. Troubleshooting and diagnostics

This chapter describes some basic troubleshooting and diagnostic programs. If your computer problem is not described here, see Chapter 8, “Getting information, help, and service,” on page 59 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	v The power cord is plugged into the rear of the computer and into a working
button.	electrical outlet.
	v If your computer has a secondary power switch on the back of the computer,
	ensure that it is switched on.
	v The power indicator on the front of the computer is on.
	v The voltage is set to the correct setting for your country.
	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:
	v The monitor cable is securely attached to the rear of the monitor and to the
	rear of the computer.
	v The monitor power cord is plugged into the monitor and into a working
	electrical outlet.
	v The monitor is turned on and the brightness and contrast controls are set
	correctly.
	v The monitor signal cable is securely connected to the monitor and to the
	monitor connector on the computer.
	Note: If your computer has two monitor connectors, verify that your monitor is
	connected to the one in the AGP option connector rather than the one in the rear
	of the system board. For more information, “Connecting your computer” on page
	3.
	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	v The computer is turned on.
to the keyboard.	v The monitor is turned on and the brightness and contrast controls are set
	correctly.
	v The keyboard is securely connected to the keyboard connector on the
	computer.
	v 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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