Activity Possible cause Recommended action
Red Power LED blinks two
times, once every second,
followed by a two-second
pause. Two beeps.
CPU thermal protection
activated by either of the
following methods:
●
A fan might be blocked
or not turning.
●
The heatsink and fan
assembly is not
properly attached to the
CPU.
CAUTION: Internal components might be powered even when the
computer is off. To prevent damage, disconnect the computer power cord
before you remove a component.
1. Ensure that the computer air vents are not blocked and the cooling
fan is running.
2. Open the access panel, press power button, and verify that the CPU
fan is spinning. If the CPU fan is not spinning, make sure the fan
cable is plugged into the computer board header. Ensure the fan is
fully and properly seated or installed.
3. If fan is plugged in and seated properly, but is not spinning, the
problem might be in the CPU fan. Contact HP for assistance.
4. Verify that the fan assembly is properly attached. If problems persist,
there might be a problem with the CPU heatsink. Contact HP for
assistance.
Red Power LED blinks three
times, once every second,
followed by a two-second
pause. Three beeps.
CPU not installed (not an
indicator of bad CPU).
1. Verify that the CPU is present.
2. Reseat the CPU.
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
computer is off. To prevent damage, disconnect the computer power cord
before you remove a component.
1. Open the access panel and ensure that all power connections (24-
pin Main, 4-pin CPU) 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 computer. 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.
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
computer is off. To prevent damage, disconnect the computer 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
computer is off. To prevent damage, disconnect the computer power cord
before you remove a component.
1. Reseat the graphics card.
2. Verify the graphics auxiliary power cable is connected (if applicable).
3. The problem might be on the graphics card. Contact HP for
assistance.
Table 6-7 Diagnostic lights and audible codes (continued)
ENWW Diagnostic codes and errors 153
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