HP dc7900 - Convertible Minitower PC

System does not power on and the LEDs on the front of the computer are not flashing.
Cause
Solution
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.
5. If the 5V_aux light on the system board is off, then replace
the power supply.
6. Replace the system board.
Table 2-1 Solving General Problems (continued)
ENWW Solving General Problems 13