HP t5325 Troubleshooting Guide: HP t5325 Thin Clients - Page 20

Power-On Sequence, Beep Codes - usb boot

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Power-On Sequence At power-on, the flash boot block code initializes the hardware to a known state, then performs basic power-on diagnostic tests to determine the integrity of the hardware. Initialization performs the following functions: 1. Initializes CPU and memory controller. 2. Initializes and configures all PCI devices. 3. Initializes USB devices to a known state. 4. The unit boots the operating system. Beep Codes uBoot provides some feedback during startup according to the following table. If the system cannot start up due to a catastrophic error (such as no RAM), no beep sounds; return the unit for service. If the system can start up but encounters some other catastrophic error (such as the SATA flash is unreadable), 3 beeps are played; return the unit for service. In normal operation, the system 1 beep should sound. If the system encounters a recoverable error such as the SATA flash is corrupted, 2 beeps sound to indicate the user should reflash the unit. Number of Beeps 0 1 2 3 Action Return for service. Normal operation. Reflash the unit. Return for service. 14 Chapter 4 Diagnostics and Troubleshooting

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Power-On Sequence
At power-on, the flash boot block code initializes the hardware to a known state, then performs basic
power-on diagnostic tests to determine the integrity of the hardware. Initialization performs the
following functions:
1.
Initializes CPU and memory controller.
2.
Initializes and configures all PCI devices.
3.
Initializes USB devices to a known state.
4.
The unit boots the operating system.
Beep Codes
uBoot provides some feedback during startup according to the following table. If the system cannot
start up due to a catastrophic error (such as no RAM), no beep sounds; return the unit for service. If
the system can start up but encounters some other catastrophic error (such as the SATA flash is
unreadable), 3 beeps are played; return the unit for service. In normal operation, the system 1 beep
should sound. If the system encounters a recoverable error such as the SATA flash is corrupted, 2
beeps sound to indicate the user should reflash the unit.
Number of Beeps
Action
0
Return for service.
1
Normal operation.
2
Reflash the unit.
3
Return for service.
14
Chapter 4
Diagnostics and Troubleshooting