HP Z600 Maintenance And Service Manual page 191

Table 6-8 Diagnostic lights and audible codes (continued)
Activity
Red Power LED blinks four
times, once every second,
followed by a two-second
pause. Four beeps.
Red Power LED blinks five
times, once every second,
followed by a two-second
pause. Five beeps.
Red Power LED blinks six
times, once every second,
followed by a two-second
pause. Six beeps.
Red Power LED blinks
seven times, once every
second, followed by a two-
second pause. Seven
beeps.
ENWW
Possible cause
Power failure (power supply
is overloaded)
Pre-video memory error
Pre-video graphics error.
System board failure (ROM
detected failure prior to
video).
Recommended action
CAUTION: Internal components might be powered even when the
workstation is off. To prevent damage, disconnect the workstation power
cord before you remove a component.
1. Open the access panel and ensure that all power connections (18-
pin Main, 8-pin CPU, 6-pin Memory) are secure on the system board.
2. Check if a device is causing the problem by removing all attached
devices (such as hard, diskette, or optical disk drives, and expansion
cards.) Power on the workstation. If the system enters the POST,
power off and replace one device at a time; repeat this procedure
until failure occurs. Replace the device that is causing the failure.
Continue adding devices one at a time to ensure all devices are
functioning properly.
3. Check the power supply functionality.
a. Disconnect the AC power.
b. Remove power supply from system chassis. (See
supply on page 78 for details.)
c. Plug in the AC power.
If the power supply fan spins and the BIST
is functional. The problem might be on the system board. Contact HP for
assistance.
If the power supply fan does not spin or the BIST
problem might be in the power supply. Contact HP for assistance.
CAUTION: Internal components might be powered even when the
workstation is off. To prevent damage, disconnect the workstation power
cord before you remove a component.
1. Reseat DIMMs.
2. Replace DIMMs one at a time to isolate faulty module.
3. Replace third-party memory with HP memory.
4. The problem might be on the system board. Contact HP for
assistance.
CAUTION: Internal components might be powered even when the
workstation is off. To prevent damage, disconnect the workstation power
cord before you remove a component.
1. Reseat the graphics card.
2. The problem might be on the graphics card. Contact HP for
assistance.
1. Clear CMOS.
NOTE: Refer to the Maintenance and Service Guide for the
workstation model for detailed information on clearing CMOS.
2. The problem might be on the system board. Contact HP for
assistance.
Diagnostic codes and errors 179
Removing the power
LED lights, the power supply
**
** LED does not light, the