Solving network problems – HP DC7800 User Manual

Page 251

Power LED flashes Red five times, once every second, followed by a two second pause, and the computer beeps five
times. (Beeps stop after fifth iteration but LEDs continue flashing.)

Cause

Solution

Reseat DIMMs. Power on the system.

Replace DIMMs one at a time to isolate the faulty module.

NOTE:

DIMM 1 must always be installed.

Replace third-party memory with HP memory.

Replace the system board.

Power LED flashes Red six times, once every second, followed by a two second pause, and the computer beeps six
times. (Beeps stop after fifth iteration but LEDs continue flashing.)

Cause

Solution

Graphics card is not seated properly or is bad, or system board
is bad.

For systems with a graphics card:

Reseat the graphics card. Power on the system.

Replace the graphics card.

Replace the system board.

For systems with integrated graphics, replace the system
board.

Power LED flashes Red ten times, once every second, followed by a two second pause, and the computer beeps ten
times. (Beeps stop after fifth iteration but LEDs continue flashing.)

Cause

Solution

Bad option card.

Check each option card by removing the cards one at time
(if multiple cards), then power on the system to see if fault
goes away.

Once bad card is identified, remove and replace bad
option card.

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 D-11

Solving Hardware Installation Problems (continued)

Solving Network Problems 239