HP dx6120 HP Business Desktop dx6100 Series Personal Computers Service Referen - Page 201
Red Power LED, the appropriate voltage. Proper voltage
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Activity Red Power LED flashes nine times, once every second, followed by a two second pause. Red Power LED flashes ten times, once every second, followed by a two second pause. System does not power on and LEDs are not flashing. Beeps 9 10 None Possible Cause System powers on but is unable to boot. Bad option card. System unable to power on. Recommended Action Check that the voltage selector, located on the rear of the power supply (some models), is set to the appropriate voltage. Proper voltage setting depends on your region. Replace the system board. Replace the processor. Check each graphics card by removing the card (one at a time if multiple cards), then power on the system to see if fault goes away. Once a bad card is identified, remove and replace the bad option card. Replace the system board. Press and hold the power button for less than 4 seconds. If the hard drive LED turns green, then: Check that the voltage selector, located on the rear of the power supply, is set to the appropriate voltage. Proper voltage setting depends on your region. Remove the expansion cards one at a time until the 3V_aux light on the system board turns on. 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: Check that the unit is plugged into a working AC outlet. Open hood and check that the power button harness is properly connected to the system board. Check that both power supply cables are properly connected to the system board. Check to see if the 3V_aux light on the system board is turned on. If it is turned on, then replace the power button harness. If the 3V_aux light on the system board is not turned on, then replace the power supply. Replace the system board. Service Reference Guide, dx6100 361293-003 C-9