HP 1105 Maintenance & Service Guide HP Pro 1105 All-in-One Business PC - Page 140

Interpreting POST Diagnostic Front Panel LEDs and Audible Codes

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Control panel message Network Server Mode Active and No Keyboard Attached Parity Check 2 Description Keyboard failure while Network Server Mode enabled. Parity RAM failure or a PCI/PCIe device is asserting a SERR#. Recommended action 1. Reconnect keyboard with computer turned off. 2. Check connector for bent or missing pins. 3. Ensure that none of the keys are depressed. 4. Replace keyboard. Run Computer Setup and Diagnostic utilities. To disable a PCI/PCIe device from asserting a SERR#, run the Computer Setup utility and select Advanced > Bus Options > SERR# Generation > Disable. Interpreting POST Diagnostic Front Panel LEDs and Audible Codes This section covers the front panel LED codes as well as the audible codes that may occur before or during POST that do not necessarily have an error code or text message associated with them. WARNING! When the computer is plugged into an AC power source, voltage is always applied to the system board. To reduce the risk of personal injury from electrical shock and/or hot surfaces, be sure to disconnect the power cord from the wall outlet and allow the internal system components to cool before touching. NOTE: If you see flashing LEDs on a PS/2 keyboard, look for flashing LEDs on the front panel of the computer and refer to the following table to determine the front panel LED codes. Recommended actions in the following table are listed in the order in which they should be performed. Not all diagnostic lights and audible codes are available on all models. Activity Green Power LED On. Green Power LED flashes every two seconds. Beeps None None Possible Cause Recommended Action Computer on. 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. Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 133

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Control panel message
Description
Recommended action
Network Server Mode Active and No
Keyboard Attached
Keyboard failure while Network Server
Mode enabled.
1.
Reconnect keyboard with computer
turned off.
2.
Check connector for bent or missing
pins.
3.
Ensure that none of the keys are
depressed.
4.
Replace keyboard.
Parity Check 2
Parity RAM failure or a PCI/PCIe device is
asserting a SERR#.
Run Computer Setup and Diagnostic
utilities. To disable a PCI/PCIe device from
asserting a SERR#, run the Computer
Setup utility and select
Advanced
>
Bus
Options
>
SERR# Generation
>
Disable
.
Interpreting POST Diagnostic Front Panel LEDs and
Audible Codes
This section covers the front panel LED codes as well as the audible codes that may occur before or
during POST that do not necessarily have an error code or text message associated with them.
WARNING!
When the computer is plugged into an AC power source, voltage is always applied to
the system board. To reduce the risk of personal injury from electrical shock and/or hot surfaces, be
sure to disconnect the power cord from the wall outlet and allow the internal system components to
cool before touching.
NOTE:
If you see flashing LEDs on a PS/2 keyboard, look for flashing LEDs on the front panel of
the computer and refer to the following table to determine the front panel LED codes.
Recommended actions in the following table are listed in the order in which they should be
performed.
Not all diagnostic lights and audible codes are available on all models.
Activity
Beeps
Possible Cause
Recommended Action
Green Power LED On.
None
Computer on.
None
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.
Interpreting POST Diagnostic Front Panel LEDs and Audible Codes
133