HP ProDesk 400 G4 Micro Maintenance and Service Guide - Page 84

Solving network problems, Table 6-2

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Computer will not start. Cause Solution 2. Observe the beeps and LED lights on the front of the computer. Beeps and flashing LEDs are codes for specific problems. 3. If you still cannot resolve the issue, contact Customer Support. 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 in Windows 7, click Start, select Control Panel, and then select Device Manager. To access Device Manager in Windows 10, 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 Web site. 76 Chapter 6 Troubleshooting without diagnostics

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Computer will not start.
Cause
Solution
2.
Observe the beeps and LED lights on the front of
the computer. Beeps and
flashing
LEDs are codes for
specific
problems.
3.
If you still cannot resolve the issue, contact Customer
Support.
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 in Windows 7, click
Start
, select
Control Panel
, and then select
Device Manager
.
To access Device Manager in Windows 10, 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 Web site.
76
Chapter 6
Troubleshooting without diagnostics