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Last Updated On March 19, 2018
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I’ve got a z800 that’s off warranty and producing a beep error as soon as it is plugged into the outlet. No indicator lights, not a standard POST error beep. Just a steady beeping sound that continues for roughly 10 seconds after the power is disconnected. I removed the power supply and plugged it into the outlet on its own. The fans spin up and the indicator light powers on so I’m fairly certain the issue isn’t there. Before I spend the cash on a refurb system board, I figured I’d ask here and see if anyone has encountered this before. 
solution: The Z800 power supply has 3 blind mate connectors, that plug into 3 connectors and cable assemblies in the chassis.  Pull out the Z800 power supply, and look at the 3 white connectors in the chassis.  Each of these 3 chassis connectors have 2 support pins each to hold the connectors in the chassis cutouts.  Check if these pins were damaged, and if the connectors were pushed out partially.  If the chassis connectors were pushed out,  it is possible the power supply is making intermittent contact with the chassis connectors/cables.

You removed the power supply and plugged it into the outlet on its own.  If the green light comes on, the supply is good (as you said below).

Sometimes, if the power cord is pulled out of the system quickly (or swtiched off from a opwer strip) after the system is shut down, the power supply can beep and the power LED can flash for a very short time afterwards.  This happens because there was not enough time for the main voltages to decay before the power cord is pulled.  It is not a failure, just an annoyance, and not the cause of your power up problem.