Troubleshooting Procedure; Troubleshooting - Lenovo ThinkCentre M79 Hardware Maintenance Manual

Symptom
The operating system does not
start.
The computer beeps multiple
times before the operating
system starts.

Troubleshooting procedure

Use the following procedure as a starting point for diagnosing problems you are experiencing with your
computer:
1. Ensure that the cables for all attached devices are connected correctly and securely.
2. Ensure that all attached devices that require ac power are connected to properly grounded, functioning
electrical outlets.
3. Ensure that all attached devices are enabled in the BIOS settings of your computer. For more information
about accessing and changing the BIOS settings, refer to "Using the Setup Utility program" on page 61.
4. Go to "Troubleshooting" on page 74 and follow the instructions for the type of problem you are
experiencing. If the Troubleshooting information does not help you resolve a problem, continue with the
next step.
5. Try using a previously captured configuration to see if a recent change to hardware or software settings
has caused a problem. Before restoring a previous configuration, capture your current configuration in
case the older configuration settings do not solve the problem or have adverse effects. To restore a
captured configuration, do the following:
a. Open Control Panel by doing one of the following:
• For Windows 7: Click the Start button to open the Start menu, and then click Control Panel.
• For Windows 8.1: See "Accessing Control Panel on the Windows 8.1 operating system" on
page 49.
• For Windows 10: Right-click the Start button to open the Start context menu, and then click
Control Panel.
b. View Control Panel using Large icons or Small icons, and then click Recovery ➙ Open System
Restore.
c. Follow the instructions on the screen.
If this does not correct the problem, continue with the next step.
6. Run the diagnostic program. See "Lenovo Solution Center" on page 84 for more information.
• If the diagnostic program detects a hardware failure or if you are unable to run the diagnostic
program, contact the Lenovo Customer Support Center. See Chapter 12 "Getting information, help,
and service" on page 149 for more information.
• If the diagnostic program does not detect a hardware failure, continue with the next step.
7. Use an antivirus program to see if your computer has been infected by a virus. If the program detects a
virus, remove the virus.
8. If none of these actions solve the problem, seek technical assistance. See Chapter 12 "Getting
information, help, and service" on page 149 for more information.

Troubleshooting

Use the troubleshooting information to find solutions to problems that have definite symptoms.
74
ThinkCentre M79 Hardware Maintenance Manual
Ensure 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 64.
Ensure that no keys are stuck.
Action