Z820 Host PC Troubleshooting

1 Overview

The follow information assists in confirming if the HP Z820 Host PC is experiencing a hardware fault. Although the following is not a complete set of diagnostics, it should be sufficient in determining if the Z820 is suffering from hardware issues at the prescribed Field Replaceable Unit (FRU) level.

Obtain complete diagnostic details for the HP Z820 PC from Hewlett Packard’s support web site: http://www.hp.com/sbso/busproducts-workstations.html

Search by PC model number and download the appropriate Technical Reference Guide.

danger

ELECTROCUTION HAZARD
there is power to the system board even when the Host PC is powered down.
per PROPER LOCKOUT / TAGOUT PROCEDURES, Disconnect AC power from the Host PC before reseating or replacing components.

2 General Troubleshooting Checklist

Before proceeding with the rest of this procedure, use the following checklist to find possible solutions for Host PC problems:

Are the Host PC and Monitors connected to a working electrical outlet?
Is the Host PC powered on?
Is the front panel green power light illuminated?
Are the monitors powered on?
Are the blue monitor lights illuminated?
Adjust the monitor brightness and contrast controls if the monitor is dim.
Press and hold any key. If the Host PC beeps, then the keyboard is operating correctly.
Examine all cables for loose or incorrect connections.
Remove all diskettes and CDs from the drives before you power on the system.
Are you running the latest BIOS version and have correct BIOS Settings?

3 LEDS

3.1 Power Supply (PSU) BIST LED (chassis rear panel, inside PSU)

The Z820 has a special LED mounted just inside the PSU rear ventilation grill. When the Built In Self Test (BIST) LED is green, the PSU is operational. (See Illustration 1.)

Table 1. Z820 Power Supply Problems (BIST LED)
Problem	Cause	Solution
Power supply shuts down intermittently.	Power supply fault	Replace Host PC.
Workstation powered off automatically and the Power LED flashes red two times, once every second, followed by a two-second pause.	Processor thermal protection activated OR Fan(s) blocked or not turning OR CPU heatsink fan assembly not properly attached to the processor	Ensure that the Host PC air vents are not blocked. Verify that the cooling fan is running. Open the access panel, press the power button, and determine if the processor fan is spinning. If the processor fan is not spinning, ensure that the fan’s cable is plugged into the system board header. Ensure that the fan is properly seated/installed. Replace the Host PC if fans are not operational or if CPU heatsinks have been disturbed.
Power LED flashes red, once every two seconds.	Power failure (power supply overloaded)	Determine whether a device is causing the problem as follows: Remove all attached devices. 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 Host PC if any devices are found to be overloading the PSU. Verify power supply functionality as follows: Disconnect AC power. Remove all internal power supply cables from the system board. Plug in AC power and ensure that the power supply fan spins and the BIST LED lights. If the power supply fan does not spin or the BIST LED does not light, replace the Host PC.

Observe these conditions over time. If this situation repeats regularly, the Host PC’s PSU or hardware is faulty. Replace the Host PC FRU. If these conditions happen rarely, look for Power and AC connection issues.

3.2 Power LED (chassis front panel)

The Power LED above the Power On/Off button has the following states:

Table 2. Z820 Front Panel Power LED and Beep Code
Power LED and Sound Activity	Diagnosis and Service Action
None	Power supply failure Press the power button less than 4 second. If HDD LED = GREEN: Remove the expansion card one at a time and try holding he power button again for less than 4 second. Replace the Host PC. If the HDD LED does not illuminate: Verify that the unit is plugged into a working AC outlet. Open the access panel and verify that the power button harness is properly connected to the inline front panel I/O device assembly connector. Verify that the power supply cables are properly connected to the system board. Verify power supply functionality.
Blinks red 2 times, once per second, then 2 second pause, 2 beeps	Thermal shutdown Ensure that the Host PC air vents are not blocked and the cooling fan is running. Open the access panel, press the power button, and see if the processor fan spins. If the processor fan is not spinning, make sure the fan cable is plugged onto the system board header. Ensure that the fan is fully/properly seated or installed. If the fan is plugged in and seated properly, but not spinning, check the processor fan. Verify that the fan assembly is properly attached. If problems persist, check the processor heatsink. Replace the Host PC.
Blinks red 3 times, once per second, then 2 second pause, 3 beeps	CPU not installed Ensure that the processor is present. Replace the Host PC.
Blinks red 4 times, once per second, then 2 second pause, 4 beeps	Power supply failure Open the access panel and ensure the following connections are secure on the system board: 18–pin main power 8–pin CPU 10–pin memory Locate the faulty device by removing all devices and reinstalling them one at a time until the Host PC fails. Replace the Host PC. Verify power supply functionality.
Blinks red 5 times, once per second, then 2 second pause, 5 beeps	Pre-video memory error Reseat DDR3 memory DIMMs. Replace the Host PC.
Blinks red 6 times, once per second, then 2 second pause, 6 beeps	Pre-video graphics card error. For systems with graphics cards, do the following: Reseat the graphics card. Replace the Host PC.
Blinks red 7 times, once per second, then 2 second pause, 7 beeps.	System board failure (ROM detected failure before video). Clear CMOS. Flash the BIOS and restore settings. Replace the Host PC.
Blinks red 8 times, once per second, then 2 second pause, 8 beeps	Invalid ROM based on bad checksum Clear CMOS. Flash the BIOS and restore settings. Replace the Host PC.
Blinks red 9 times, once per second, then 2 second pause, 9 beeps	System power is on but unable to boot. Replace the Host PC.

3.3 Hard Drive Activity LED

The Disk Activity LED below the Power On/Off button flickers whenever the system is accessing either hard drive.

3.4 Network Activity LEDs

The network activity LEDs at the rear of the Host PC chassis (including both the onboard network port and the two Dual Port GBe card ports) flicker whenever there is network activity on that port. These LEDs remain a solid light as long as the system is plugged into AC power with the power switch on and connected to other live Ethernet ports.

4 HP Z820 Advance Error Reporting (POST)

POST is a program run at startup that initializes and runs various tests on installed hardware. An audible and/or visual message occurs if the POST encounters a problem.

All errors are reported on the POST screen at the end of POST, before booting the OS. If there are any Fatal or Uncorrectable Non-Fatal errors reported, you are presented with an F1 Boot prompt. This ensures that the system doesn't boot before you are able to see the errors.

note:

The errors displayed are from the previous boot. They occurred before the most recent reboot, or they caused the most recent reboot.

HP Z820 POST Error Messages

POST checks the following items to ensure that the computer system is functioning properly:

Keyboard
DIMMs
Diskette drives
All mass storage devices
CPUs
Controllers
Fans
Temperature sensors
Cables (front/rear panels, audio, and USB ports)

The table shown next describes the POST error messages.

Table 3. Z820 POST Error Messages
Screen Message	Probable Cause	Recommended Action
102–System Board Failure		Potential system board problem; contact HP Support.
110–Out of Memory for Option ROMs.	Option ROM for a device could not run because of memory constraints.	Run Computer Setup F10Utility to disable unneeded option ROMs, and to enable ACPI/USB Buffers at Top of Memory.
161–Real-Time Clock Power Loss		Run Computer Setup F10 utility and set default settings. Replace the CMOS battery. Replace the system board.
162–System Options Error		Run Computer Setup (F10 utility and set default settings. Replace the CMOS battery. Replace the system board.
163–Time and Date Not Set	Invalid time or date in configuration memory. RTC battery might need to be replaced. CMOS jumper might be improperly installed.	Set the date and time from the Control Panel or in Computer SetupF10 Utility (depending on the operating system). If the problem persists, replace the RTC battery.
164–Memory Size Error	Memory configuration is incorrect.	Confirm that the correct memory is installed in the system.
201–Memory Error	RAM failure.	Run Computer Setup (F10 utility or the Windows utilities. Be sure that memory modules are installed correctly. Verify the memory module type. Remove and replace memory modules one at a time to isolate faulty modules. Replace faulty memory modules. If the error persists after replacing memory modules, replace the system board.
214–DIMM Configuration Warning	DIMMs not installed correctly (not paired correctly).	See the service label on the computer access panel for the correct memory configurations, and reseat the DIMMs accordingly.
301–Keyboard Error.	Keyboard failure.	Reconnect the keyboard with the computer powered off. Connect a keyboard directly to the computer (instead of through a switch box). Be sure that none of the keys are pressed. Replace the keyboard.
303–Keyboard Controller Error	I/O board keyboard controller is defective or is not set properly.	Reconnect the keyboard with the computer powered off. Connect a keyboard directly to the computer (instead of through a switch box). Replace the system board.
304–Keyboard or System Unit Error	Keyboard failure.	Reconnect the keyboard with the computer powered off. Connect a keyboard directly to the computer (instead of through a switch box). Be sure that none of the keys are pressed. Replace keyboard. Replace system board.
510–Splash Screen image corrupted	Splash Screen image has errors	Update system BIOS/UEFI.
511–CPU Fan not detected	Fan is not connected or is defective.	Reseat the fan cable. Reseat fan. Replace the fan.
512– Rear chassis fan not detected	Fan missing, disconnected, or defective.	Reseat the fan cable. Reseat the fan. Replace the fan.
513– Front Chassis fan not detected	Front fan missing, disconnected, or defective.	Reseat the fan cable. Reseat the fan. Replace the fan.
514– Power supply wattage insufficient for hardware configuration	Computer configuration requires more power than the power supply can provide	Reduce the computer power consumption.
515– Power supply fan not detected	Power supply fan is disconnected or defective.	Reseat the power supply cables. Replace the power supply.
517– Memory fan not detected	Memory fan missing, disconnected, or defective.	Reseat the fan cable. Reseat the fan. Replace the fan.
518– PCI fan not detected	PCI fan missing, disconnected, or defective.	Reseat the fan cable. Reseat the fan. Replace the fan.
519–Hard drive fan not detected	Hard drive fan missing, disconnected, or defective.	Reseat the fan cable. Reseat the fan. Replace the fan.
520– Memory fan (2) not detected	Memory fan (2) missing, disconnected, or defective.	Reseat the fan cable. Reseat the fan. Replace the fan.
521– Memory fan (3) not detected	Memory fan (3) missing, disconnected, or defective.	Reseat the fan cable. Reseat the fan. Replace the fan.
522– Memory fan (4) not detected	Memory fan (4) missing, disconnected, or defective.	Reseat the fan cable. Reseat the fan. Replace the fan.
523– CPU fan (2) not detected	CPU fan (2) missing, disconnected, or defective.	Reseat the fan cable. Reseat the fan. Replace the fan.
524– Rear chassis fan (2) not detected	Rear chassis fan (2) missing, disconnected, or defective.	Reseat the fan cable. Reseat the fan. Replace the fan.
525– Front chassis fan (2) not detected	Front chassis fan (2) missing, disconnected, or defective.	Reseat the fan cable. Reseat the fan. Replace the fan.
526– CPU Liquid Cooling pump not detected	Liquid cooling pump on CPU1 is not detected.	Reseat the pump cable. Replace the pump.
527– CPU Liquid Cooling pump (2) not detected	Liquid cooling pump on CPU2 is not detected.	Reseat the pump cable. Replace the pump.
528– CPU requires Liquid Cooling solution	Invalid system configuration.	Remove incorrect processor and reinstall original processor. Remove incorrect cooling solution and reinstall original liquid cooling solution.
529– Unsupported WiFi Device(s) Detected	An unsupported WiFi device has been installed into an internal slot.	Remove the unsupported device.
917–Front Audio Not Connected	Front Audio mechanism is missing or is not connected.	Replace or reconnect the missing front audio mechanism to the system board. Reseat or replace the missing mechanism cable.
918–Front USB Not Connected	Front USB mechanism is missing or is not connected.	Replace or reconnect the missing Front USB mechanism to the system board. Reseat or replace the missing mechanism cable.
921–Front USB Not Connected	Front USB mechanism is missing or is not connected.	Replace or reconnect the missing Front USB mechanism to the system board. Reseat or replace the missing mechanism cable.
922–Front USB 2 Not Connected	Front USB 2 mechanism is missing or is not connected.	Replace or reconnect the missing Front USB 2 mechanism to the system board. Reseat or replace the missing mechanism cable.
923– Fatal IRPP error.		Potential system problem; contact HP Support.
924– Fatal IIO error.		Potential system problem; contact HP Support.
925– Fatal Misc. Error	A fatal miscellaneous chipset error is selected.
927– Fatal error on DIMM in slot CPU X DIMM Y	Fatal multibit ECC error detected on the DIMM in the slot labeled DIMM Y(where Y is a number), as labeled on the system board.	Replace the DIMM in the identified slot.
928– Fatal error occurred in the designated slot.	Fatal error occurred in the designated slot.	Move the card to a different slot. If the problem persists, replace the card.
929– Fatal MCA Error	An MCA condition is detected on the system.
939– Front USB 3.0 Not Connected	Front USB 3.0 mechanism is missing or is not connected.	Replace or reconnect the missing Front USB 3.0 mechanism to the system board. Reseat or replace the missing mechanism cable.
940– Front 1394 Not Connected	Front 1394 mechanism is missing or is not connected.	Replace or reconnect the missing Front 1394 mechanism to the system board. Reseat or replace the missing mechanism cable.
941– PCIe Device(s) installed in slots 3 or 4 with a single CPU	Invalid system configuration.	Move the PCIe device from PCIe slots 3 and/or 4 to other PCIe slots. Add a second processor using appropriate HP accessory kit.
942– Memory Train Error	A DIMM or DIMMs did not train correctly.
1801– Microcode Update Error	Unknown or unsupported processor stepping.	The microcode update failed. If the processor stepping is supported, contact HP Support.
1802– Processor Not Supported	The system board does not support the processor.	Replace the processor with a compatible one.
Invalid Electronic Serial Number	Electronic serial number has become corrupted.	Run Computer Setup. If Setup already has data in the field or does not allow you to enter the serial number, replace the Host PC. Run Computer Setup and try to enter the serial number under Security>System ID. Save the changes.
Network Server Mode Active and No Keyboard Attached	Keyboard not detected.	Verify that a keyboard is attached.

Color	Host PC State
None	Off OR Hibernate(not used)
Solid Blue	On
Flashing Blue (once per second)	Standby (not used)
Solid or Flashing Red	Error