Lenovo 4222, 4220, 4215, 4219, 4221 manual Troubleshooting and diagnostics, Basic troubleshooting

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 69 for additional troubleshooting resources.

Basic troubleshooting

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

Note: If you cannot correct the problem, have the computer serviced. For a list of

	service and support telephone numbers, refer to the ThinkStation Safety and
	Warranty Guide that comes with your computer or go to the Lenovo Support
	Web site at http://www.lenovo.com/support/phone.
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 If your computer has a secondary power switch on the rear of the computer,
		make sure that it is switched on.
		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 monitor signal cable is correctly connected to the monitor and to the
		appropriate monitor connector on the computer.
		v The monitor power cord is correctly connected to the monitor and to a
		working electrical outlet.
		v The monitor is turned on and the brightness and contrast controls are set
		correctly.
		v The computer voltage matches the voltage available at the electrical outlet for
		your country or region.
		v If your computer has two monitor connectors, be sure to use the connector on
		the graphics card.
The keyboard does not work.		Verify that:
		v The computer is turned on.
		v The keyboard is securely connected to a USB connector or the PS/2 keyboard
		connector on the computer.
		v No keys are stuck.
The mouse does not work.		Verify that:
		v The computer is turned on.
		v The mouse is correctly connected to a USB connector or the PS/2 mouse
		connector on the computer.
		v The mouse is clean. Refer to “Cleaning the mouse” on page 66 for further
		information.

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