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Hello everyone, I registered to share the following. I had the same problem. The best for me is that I have 2 Z840. One had the problem and the other didn't. I moved all my drives, memory, PCIe and Processors to the working pc. I see something different, when turning on, I had not used the quadro k620 card in both, but in this Time i add it.

 

I conected the monitor in the Quadro card, ando whit this appears again the options of ESC and CTRL+P options.

 

With this difference, I quickly moved the K620 quadro card to the computer with boot failure.

 

Now when I start, they put me the option to enter the boot menu with the ESC key.

 

Reducing.- The boot agent failure happened to me with an ATI FirePro V3900 card.

 

Troubleshooting.- With the Quadro K620 card everything Is ok.

 

Now I have my 2 functional workstations.

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