HP Pro 3520 PC Maintenance & Service Guide HP Pro 3520 All-in-One Business - Page 146
Red Power LED flashes, system board.
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Activity Red Power LED flashes twelve iteration but LEDs continue until problem is solved. System does not power on and LEDs are not flashing. Beeps 12 None Possible Cause MXM thermal shutdown. System unable to power on. Recommended Action 1. Clean the MXM graphics card heat sink. 2. Replace the MXM graphics card heat sink. 3. Replace the MXM graphic card. Press and hold the power button for less than 4 seconds. If the hard drive LED turns green, the power button is working correctly and the system board needs to be replaced. 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. Open hood and check that the power button harness is properly connected to the system board. 3. Check that both power supply cables are properly connected to the system board. 4. Check to see if the 5V_aux light on the system board is turned on. If it is turned on, then replace the power button harness. If the problem persists, replace the system board. 5. If the 5V_aux light on the system board is not turned on, remove the expansion cards one at a time until the 5V_aux light on the system board turns on. It the problem persists, replace the power supply. 138 Appendix D POST Error Messages