HP Z620 Red Alert

[mehr94]

My HP Z620 system occuring issue when power on. Machine gives 4 short beep with red power alert.

I have already seen the forum for solution but there are answers which says that without rizer it works fine but in my case with or without rizer the issue remains same.. 

[Brian1965]

It sounds like you might be overloading the PSU, or the PSU itself may have a fault, (or another system component, e.g. graphics card, etc.)

According to the HP Z620 Maintenance and Service Guide;-

Symptom

Red Power LED blinks four times, once every second, followed by a two-second pause. Four beeps.

Possible Cause
Power failure (power supply is overloaded).

Recommended Action

CAUTION: Internal components might be powered even when the computer is off.  To prevent damage, disconnect the computer power cord before you remove a component.
1. Open the access panel and ensure that all power connections are secure on the system board.
2. Check if a device is causing the problem by removing all attached devices (such as hard, diskette, or optical disk drives, and expansion cards.) Power on the computer. If the system enters the POST, power off and replace one device at a time; repeat this procedure until failure occurs. Replace the device that is causing the failure. Continue adding devices one at a time to ensure all devices are functioning properly.

I recommend you check for any loose connectors and also remove and re-seat any PCIe cards and the RAM modules. Try testing the system with a minimum specification, i.e. single CPU, 1 stick of RAM, OS drive and a GPU. You can also test the PSU via the BIST (Built-In-Self-Test).

To check the power supply functionality.
a. Disconnect the AC power.
b. HP Z820 Workstation only — Remove the power supply from the chassis. All other workstations, unplug cables connected to system board.
c. Plug in AC power.
● If the power supply fan spins and the BIST LED illuminates, the power supply is good.
● If the power supply fan does not spin or the LED does not illuminate, replace the power supply.

NOTE: The LED is only visible from the rear of the PSU.