My HP D530C does not power on. The power LED flashes 4 times. What is the fault? Pls let me know asap. Thanks.

HP xw6200 Workstation - Diagnostic LED Code: Four Flashes ISSUE: When the workstation is powered on, the front LED might flash red four times, once per second, followed by a two second pause. SOLUTION: The front LED flashing four times is a sign of a power failure. To fix this issue, complete the following steps:

1. Open the access panel, and check to see if the four-wire power supply cable is properly connected to the system board.
2. There may be a faulty device. Locate it by removing all devices and then reinstalling them one at a time until the workstation fails. Replace the device causing the failure. Continue adding devices to ensure all are functioning properly.
3. Verify the power supply functionality, as follows:
   1. Disconnect AC power.
   2. Remove all internal power supply cables from the system board.
   3. Plug in AC power.
      • If the power supply fan spins, and the BIST LED illuminates, then the power supply is good. Replace the system board.
      • If the power supply fan does not spin, or the BIST LED does not illuminate, replace the power supply.