Lenovo M5800 Lenovo M5800 Hardware Maintenance Manual - Page 37

Troubleshooting and diagnostics, Basic troubleshooting

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Chapter 4. Troubleshooting and diagnostics This chapter describes some basic troubleshooting and diagnostic programs. If your computer problem is not described here, see "Lenovo Support Web site" on page 28 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. Go to the Lenovo Support Web site at http://www.lenovo.com/support/phone. Symptom The computer does not start when you press the power switch. The monitor screen is blank. The keyboard does not work. The mouse does not work. The operating system does not start. The computer beeps multiple times before the operating system starts. Action Verify that: • The power cord is correctly connected to the rear of the computer and to a working electrical outlet. • If your computer has a secondary power switch on the rear of the computer, make sure that it is switched on. • 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. Verify that: • The monitor signal cable is correctly connected to the monitor and to the appropriate monitor connector on the computer. • The monitor power cord is correctly connected to the monitor and to a working electrical outlet. • The monitor is turned on and the brightness and contrast controls are set correctly. • The computer voltage matches the voltage available at the electrical outlet for your country or region. • If your computer has two monitor connectors, be sure to use the connector on the graphics card. Verify that: • The computer is turned on. • The keyboard is securely connected to a USB connector on the computer. • No keys are stuck. Verify that: • The computer is turned on. • The mouse is securely connected to a USB connector on the computer. • The mouse is clean. Verify that: • The startup sequence includes the device where the operating system resides. Usually, the operating system is on the hard disk drive. For more information, see "Selecting a startup device" on page 51. Verify that no keys are stuck. © Copyright Lenovo 2013 31

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Chapter 4.
Troubleshooting and diagnostics
This chapter describes some basic troubleshooting and diagnostic programs. If your computer problem is
not described here, see “Lenovo Support Web site” on page 28 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. Go to the Lenovo Support Web site at
Symptom
Action
The computer does not start
when you press the power
switch.
Verify that:
•
The power cord is correctly connected to the rear of the computer and to a
working electrical outlet.
•
If your computer has a secondary power switch on the rear of the computer,
make sure that it is switched on.
•
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 monitor signal cable is correctly connected to the monitor and to the
appropriate monitor connector on the computer.
•
The monitor power cord is correctly connected to the monitor and to a working
electrical outlet.
•
The monitor is turned on and the brightness and contrast controls are set
correctly.
•
The computer voltage matches the voltage available at the electrical outlet for
your country or region.
•
If your computer has two monitor connectors, be sure to use the connector
on the graphics card.
The keyboard does not work.
Verify that:
•
The computer is turned on.
•
The keyboard is securely connected to a USB connector on the computer.
•
No keys are stuck.
The mouse does not work.
Verify that:
•
The computer is turned on.
•
The mouse is securely connected to a USB connector on the computer.
•
The mouse is clean.
The operating system does not
start.
Verify that:
•
The startup sequence includes the device where the operating system resides.
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
times before the operating
system starts.
Verify that no keys are stuck.
© Copyright Lenovo 2013
31