Solving Network Problems - HP ProDesk 680 G3 MT Maintenance And Service Manual

Computer will not start.
Cause
Power LED flashes Red three times and then white two times.
Cause
Memory is installed incorrectly or is bad.

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.
80 Chapter 6 Troubleshooting without diagnostics
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.
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.
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.