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Interpreting POST Diagnostic Front Panel LEDs and Audible Codes for HP Business PC's

 

Activity Beeps Possible Cause Recommended Action
Green Power On None None Working System
Green Power LED flashes every two seconds
None
Computer in Suspend to RAM mode (some models only) or normal Suspend mode.
None required. Press any key or move the mouse
to wake the computer.
Red Power LED flashes two times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved.
2
Processor thermal protection  activated: A fan may be blocked or
not turning.

OR
 
The heatsink/fan assembly is not properly attached to the processor.
1. Ensure that the computer air vents are not
blocked and the processor cooling fan is
running.
 
2.Open hood, press power button, and see if
the processor fan spins. If the processor fan
is not spinning, make sure the fan's cable is
plugged onto the system board header.
 
3.If fan is plugged in, but is not spinning, then
replace heatsink/fan assembly.
 
4.Contact an authorized reseller or service
provider
Red Power LED flashes three times, once every second, followed by a two second
pause. Beeps stop after fifth iteration but LEDs continue until problem is solved.
3
Processor not installed (not an indicator of bad processor).
1. Check to see that the processor is present.
2. Reseat the processor.
Red Power LED flashes four times, once every second, followed by a two second
pause. Beeps stop after fifth iteration but LEDs continue until problem is solved.
4
Power failure (power supply is overloaded)
1. Open the hood and ensure the 4 or 6-wire
power supply cable is seated into the
connector on the system board.
 
2. Check if a device is causing the problem by
removing ALL attached devices (such as
hard or optical drives and expansion cards).
Power on the system. If the system enters the
POST, then power off and replace one
device at a time and 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. Replace the power supply.
4. Replace the system board
Red Power LED flashes five times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved.
5 Pre-video memory error
CAUTION:
To avoid damage to the DIMMs or the system board, you must unplug the computer power cord before attempting to reseat, install, or remove a DIMM module.
1. Reseat DIMMs.
2. Replace DIMMs one at a time to isolate the faulty module.
3. Replace third-party memory with HP memory.
4. Replace the system board.
Red Power LED flashes six times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved.
6 Pre-video memory error
For systems with a graphics card:
1. Reseat the graphics card.
2. Replace the graphics card.
3.Replace the system board.
 
For systems with integrated graphics, replace the
system board
 
Red Power LED flashes seven times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved
 7  
System board failure (ROM detected failure prior to video).
 Replace the system board.
 
Red Power LED flashes eight times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved.
 8  
Invalid ROM based on bad checksum
 
1. Reflash the system ROM with the latest BIOS image. See the “Boot Block Emergency Recovery Mode” section of the
Desktop Management Guide for more information.
2. Replace the system board.
Red Power LED flashes nine times, once every second, followed by a two second pause. Beeps stop after fifth
 9  
System powers on but is unable to boot.
 
Check that the voltage selector, located on
the rear of the power supply (some models),
is set to the appropriate voltage. Proper
voltage setting depends on your region.
2.
Unplug the AC power cord from the
computer, wait 30 seconds, then plug the
power cord back in to the computer.
 
Red Power LED flashes ten times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved
 10  Bad option card  
1. Check each option card by removing the card
(one at a time if multiple cards), then power
on the system to see if fault goes away.
2. Once a bad card is identified, remove and
replace the bad option card.
3. Replace the system board
 
Red Power LED flashes eleven times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved
11  
The current processor does not support a feature previously enabled on this system
 
1. Install a TXT capable processor.
2.Disable TXT in the Computer Setup (F10) utility.
3.Reinstall the original processor.
 
System does not power on and LEDs are not flashing.
 NONE  
System unable to power on
 
Press and hold the power button for less than 4
seconds. If the hard drive LED turns green, the
power button is working correctly. Try the
following:
 
1.Check that the voltage selector (some
models), located on the rear of the power
supply, is set to the appropriate voltage.
Proper voltage setting depends on your
region.
 
2. Replace the system board.
OR
Press and hold the power button for less than 4
seconds. If the hard drive LED does not turn on
green then:
 
1. Check that the unit is plugged into a working
AC outlet.
 
2. Open hood and check that the power button
harness is properly connected to the system
board.
 
3. Check that both power supply cables are
properly connected to the system board.
 
4. Check to see if the 5V_aux light on the
system board is turned on. If it is turned on,
then replace the power button harness. If the
problem persists, replace the system board.
 
5. If the 5V_aux light on the system board is not
turned on, remove the expansion cards one
at a time until the 5V_aux light on the system
board turns on. It the problem persists,
replace the power supply.

 

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