HP Xw6400 - Workstation - 4 GB RAM Reference Manual page 117

Table 5-3 Minor problems (continued)
Problem
Workstation appears to pause
periodically.
Cursor will not move using the
arrow keys on the keypad.
Poor performance is
experienced.
Workstation powered off
automatically and the Power
LED flashes red 2 times, once
every second, followed by a 2-
second pause, and two
simultaneous beeps are
heard.
System does not power on,
and the LEDs on the front of
the workstation are not
flashing.
ENWW
Cause
Network driver is loaded and no
network connection is
established.
The Num Lock key might be on.
Processor is hot.
Hard drive is full.
Processor thermal protection
activated.
A fan might be blocked or not
turning.
OR
The CPU heatsink is not properly
attached to the processor.
System unable to power on.
Possible Solution
Establish a network connection, or use Computer Setup or
Microsoft Windows Device Manager to disable the network
controller.
Press the Num Lock key. The Num Lock key can be
disabled (or enabled) in Computer Setup.
1. Be sure airflow to the workstation is not blocked.
2. Be sure the fans are connected and working properly
(some fans only operate when needed).
3. Be sure the CPU heatsink is installed properly.
Transfer data from the hard drive to create more space on
the hard drive.
1. Be sure workstation air vents are not blocked and the
cooling fan is running.
2. Open the access panel, press the power button, and
see if the processor fan spins. If not spinning, be sure
the fan's cable is plugged into the system board
header. Be sure the fan is fully/properly seated or
installed.
3. Replace the processor fan.
4. Reseat CPU heatsink and verify that the fan assembly
is properly attached.
Press and hold the power button for less than 4 seconds. If
the hard drive LED turns green, then:
1. Remove the expansion cards.
2. Replace the system board.
OR
Press and hold the power button for less than 4 seconds. If
HDD LED does not illuminate, then:
1. Verify that the unit is plugged into a working AC outlet.
2. Open the access panel and verify that the power button
harness is properly connected to the inline front panel
I/O device assembly connector.
3. Verify that the power supply cables are properly
connected to the system board.
4. Verify the power supply functionality.
a. Disconnect AC power.
b. Remove all internal power supply cables from the
system board.
c. Plug in AC power.
● If the power supply fan spins and the BIST
LED illuminates, then the power supply is
good. Replace the system board.
●
If the power supply fan does not spin or the
BIST LED does not illuminate, replace the
power supply.
Troubleshooting scenarios and solutions 107