Lenovo 4265, 4271, 4272, 4269, 4264 Troubleshooting and diagnostic programs, Basic troubleshooting

Chapter 7. Troubleshooting and diagnostic programs

This chapter provides information about some basic troubleshooting and diagnostic programs. If your computer problem is not described in this chapter, see Chapter 8 “Getting information, help, and service” on page 65 for additional troubleshooting resources.

This chapter contains the following topics:

•“Basic troubleshooting” on page 61

•“Diagnostic programs” on page 62

•“Cleaning an optical mouse” on page 64

Basic troubleshooting

The following table provides some basic information to help you troubleshoot your computer problems.

Note: If you cannot solve the problem after doing the basic troubleshooting, have the computer serviced. Refer to the ThinkStation Safety and Warranty Guide that came with your computer for the safety and warranty information and the list of Lenovo Support telephone numbers.

Symptom	Action
The computer does not start	Verify that:
when you press the power	• The power cord is correctly connected to the rear of the computer and to a
switch.
	working electrical outlet.
	• The power indicator on the front of the computer is on.
	• The computer voltage matches the voltage available at the electrical outlet for
	your country or region.
The monitor screen is blank.	Verify that:
	• The power cord is correctly connected to the rear of the computer and to a
	working electrical outlet.
	• The computer voltage matches the voltage available at the electrical outlet for
	your country or region.
	• The brightness and contrast controls are set correctly.
The USB keyboard or mouse	Verify that:
does not work.	• The computer is turned on.
	• The keyboard or mouse is correctly connected to one of the USB connectors
	on the computer.
	• For the keyboard, no keys are stuck.
	• The mouse is clean. Refer to “Cleaning an optical mouse” on page 64.
The operating system does not	Verify that you list the device where the operating system resides in the startup
start.	device sequence. Usually, the operating system is on the hard disk drive. For more
	information, see “Selecting a startup device” on page 51.
The computer beeps multiple	Verify that no keys are stuck.
times before the operating
system starts.

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