HP RP7 Hardware Reference Guide HP RP7 Retail System Model 7800 - Page 73
Interpreting POST Diagnostic Front Panel LEDs and Audible Codes
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Table A-1 Diagnostic Front Panel LEDs and Audible Codes (continued) Activity Beeps Possible Cause Recommended Action Power LED flashes 12 times, 12 once every second, followed by a two second pause. Beeps stop after third iteration and the computer reboots. Health timer expired. None. 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. 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. Ensure that the DC power cable is plugged into the I/O panel. 3. Replace the power supply. Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 67