Activity Possible cause Recommended action
Red Power LED blinks
four times, once every
second, followed by a
two-second pause.
Four beeps.
Power failure (power
supply is overloaded)
CAUTION: Internal components might be powered even
when the system is off. To prevent damage, disconnect the
workstation power cord before you remove a component.
1. Open the access panel and ensure the main power,
CPU, and memory connections 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 drives, and expansion cards.) Power on the
system. 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. Disconnect ALL internal power supply cables.
c. Plug in the AC power.
If the power supply fan spins and the BIST
**
LED lights, the
power supply 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
**
LED
does not light, the problem might be in the power supply.
Contact HP for assistance.
Red Power LED blinks
five times, once every
second, followed by a
two-second pause.
Five beeps.
Pre-video memory
error
CAUTION: Internal components might be powered even
when the system 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.
Red Power LED blinks
six times, once every
second, followed by a
two-second pause. Six
beeps.
Pre-video graphics
error.
CAUTION: Internal components might be powered even
when the system 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.
Red Power LED blinks
seven times, once
every second, followed
by a two- second
pause. Seven beeps.
System board failure
(ROM detected failure
prior to video).
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.
Table 11-8 Diagnostic lights and audible codes (continued)
86 Chapter 11 Diagnostics and troubleshooting ENWW
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