HP Pro Tower 400 G9 PCI Desktop PC Maintenance and Service Guide - Page 98
minor error category short blinks. For example
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● Blink error code sequences continue until the computer is unplugged or the power button is pressed. NOTE: Not all diagnostic lights and audible codes are available on all models. The red LED blinks to represent the major error category (long blinks). The white LED blinks to represent the minor error category (short blinks). For example, '3.5' indicates 3 long red blinks and 5 short white blinks to communicate the processor is not detected. Table 7-3 Interpreting POST diagnostic front panel lights and audible codes Category Major/minor code Description BIOS Hardware 2.2 The main area (DXE) of BIOS has become corrupted, and there is no recovery binary image available. 2.3 The embedded controller policy requires the user to enter a key sequence. 2.4 The embedded controller is checking or recovering the boot block. 3.2 The embedded controller has timed out waiting for BIOS to return from memory initialization. 3.3 The embedded controller has timed out waiting for BIOS to return from graphics initialization. 3.4 The system board displays a power failure (crowbar).* 3.5 The processor is not detected.* 3.6 The processor does not support an enabled feature. Thermal 3.7 The access panel/top cover has been opened since last boot. 4.2 A processor over temperature condition has been detected.* 4.3 An ambient temperature over temperature condition has been detected. 4.4 An MXM over temperature condition has been detected. System board 5.2 5.3 5.4 5.5 The embedded controller cannot find valid firmware. The embedded controller has timed out waiting for the BIOS. The embedded controller has timed out waiting for BIOS to return from system board initialization. The embedded controller rebooted the system after a possible lockup condition had been detected through the use of a System Health Timer, Automated System Recovery Timer, or other mechanism. * Indicates hardware-triggered event; BIOS controls all other events. Interpreting POST diagnostic front panel lights and audible codes 91