Lenovo 20CD0033US Beep errors, Memory module problems, Networking problems, Ethernet problems

Beep errors

Table 6. Beep errors

Problem	Solution
One short beep, pause, three short beeps, pause, three	The memory module has a problem. Have the computer
more short beeps, and one short beep	serviced.
Three short beeps, pause, one short beep, pause, one	PCI resource allocation failure. Power off the computer
more short beep, and three short beeps	and remove the PCI devices. If the beeps persist, have
	the computer serviced.
One long and two short beeps	The video function has a problem. Have the computer
	serviced.
Four cycles of four short beeps	The Security Chip has a problem. Have the computer
	serviced.
Five short beeps	The system board has a problem. Have the computer
	serviced.
Five short beeps, pause, five short beeps, and pause	Continue to boot immediately when the error was
	detected.

Memory module problems

Print these instructions now and keep the instructions with your computer for reference later.

If your memory module is not operating properly, check the following items:

1.Check for error messages during startup.

Follow the appropriate corrective actions for power-on self-test (POST) error messages.

2.Verify that the latest UEFI BIOS for your model has been installed.

3.Verify the proper memory configuration and compatibility including the maximum memory size and the memory speed.

4.Run the Lenovo Solution Center program.

Networking problems

The following are the most common networking problems:

Ethernet problems

•Problem: The computer cannot connect to the network.

Solution: Make sure that:

–The Lenovo USB 2.0 Ethernet Adapter or supported ThinkPad OneLink Dock is connected correctly to your computer.

–The cable is installed correctly.

The network cable must be securely connected both to the Lenovo USB 2.0 Ethernet Adapter of your computer and to the RJ45 connector of the hub. The maximum allowable distance from the computer to hub is 100 meters. If the cable is connected and the distance is within acceptable limits but the problem persists, try a different cable.

–You are using the correct device driver. To install the correct driver, do the following:

1.Open Control Panel and click Hardware and Sound ➙ Device Manager. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

Chapter 9. Troubleshooting computer problems 85