Lenovo 4266, 4271, 4272, 4269, 4265 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 71 for additional troubleshooting resources.

This chapter contains the following topics:

v“Basic troubleshooting”

v“Diagnostic programs” on page 68

v“Cleaning an optical mouse” on page 69

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		v The power cord is correctly connected to the rear of the computer and to a
switch.		working electrical outlet.
		v The power indicator on the front of the computer is on.
		v The computer voltage matches the voltage available at the electrical outlet for
		your country or region.
The monitor screen is blank.		Verify that:
		v The power cord is correctly connected to the rear of the computer and to a
		working electrical outlet.
		v The computer voltage matches the voltage available at the electrical outlet for
		your country or region.
		v The brightness and contrast controls are set correctly.
The USB keyboard or mouse		Verify that:
does not work.		v The computer is turned on.
		v The keyboard or mouse is correctly connected to one of the USB connectors on
		the computer.
		v For the keyboard, no keys are stuck.
		v The mouse is clean. Refer to “Cleaning an optical mouse” on page 69.
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 55.
The computer beeps multiple		Verify that no keys are stuck.
times before the operating
system starts.

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