HP ProDesk 400 G5 Micro Maintenance and Service Guide - Page 89

Solving network problems, not discuss the process of debugging the network cabling.

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Power LED flashes Red three times and then white two times. Cause Memory is installed incorrectly or is bad. Solution CAUTION: To avoid damage to the DIMMs or the system board, you must unplug the computer power cord before attempting to reseat, install, or remove a DIMM module. 1. Reseat DIMMs. Power on the system. 2. Replace DIMMs one at a time to isolate the faulty module. NOTE: DIMM1 or XMM1 must always be installed. DIMM1 must be installed before DIMM2, and DIMM3 must be installed before DIMM4 3. Replace third-party memory with HP memory. 4. Replace the system board. Solving network problems Some common causes and solutions for network problems are listed in the following table. These guidelines do not discuss the process of debugging the network cabling. Table 6-2 Solving network problems Network driver does not detect network controller. Cause Network controller is disabled. Incorrect network driver. Solution 1. Run Computer Setup and enable network controller. 2. Enable the network controller in the operating system using Device Manager. To access Device Manager, type device manager in the taskbar search box, and then select Device Manager from the list of applications. Check the network controller documentation for the correct driver or obtain the latest driver from the manufacturer's website. Network status link light never flashes. NOTE: The network status light is supposed to flash when there is network activity. Cause Solution No active network is detected. Check cabling and network equipment for proper connection. Network controller is not set up properly. Check for the device status within Windows, such as Device Manager for driver load and the Network Connections applet within Windows for link status. To access Device Manager, type device manager in the taskbar search box, and then select Device Manager from the list of applications. Network controller is disabled. 1. Run Computer Setup and enable network controller. Solving network problems 83

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Power LED flashes Red three times and then white two times.
Cause
Solution
Memory is installed incorrectly or is bad.
CAUTION:
To avoid damage to the DIMMs or the system board,
you must unplug the computer power cord before attempting to
reseat, install, or remove a DIMM module.
1.
Reseat DIMMs. Power on the system.
2.
Replace DIMMs one at a time to isolate the faulty module.
NOTE:
DIMM1 or XMM1 must always be installed. DIMM1
must be installed before DIMM2, and DIMM3 must be installed
before DIMM4
3.
Replace third-party memory with HP memory.
4.
Replace the system board.
Solving network problems
Some common causes and solutions for network problems are listed in the following table. These guidelines do
not discuss the process of debugging the network cabling.
Table 6-2
Solving network problems
Network driver does not detect network controller.
Cause
Solution
Network controller is disabled.
1.
Run Computer Setup and enable network controller.
2.
Enable the network controller in the operating system using
Device Manager.
To access Device Manager, type
device manager
in
the taskbar search box, and then select
Device Manager
from
the list of applications.
Incorrect network driver.
Check the network controller documentation for the correct driver
or obtain the latest driver from the manufacturer’s website.
Network status link light never flashes.
NOTE:
The network status light is supposed to flash when there is network activity.
Cause
Solution
No active network is detected.
Check cabling and network equipment for proper connection.
Network controller is not set up properly.
Check for the device status within Windows, such as Device
Manager for driver load and the Network Connections applet within
Windows for link status.
To access Device Manager, type
device manager
in the taskbar
search box, and then select
Device Manager
from the list of
applications.
Network controller is disabled.
1.
Run Computer Setup and enable network controller.
Solving network problems
83