disable POST Errors?

Hello Community,

i am running a Z420 workstation as a Host for a few VMs. 

By doing so i connected the front-USB3 plug to a pcie USB3 card while the header on the motherboard is connected to a PCI-Bracket on the back.

Thing is that this way in POST the machine is complaining about 'Front USB3 is not connected' , however i can press F1 on a keyboard connected to the bus on the PCI-bracket (thus mainboard header) to skip the message ?

Is there any way to disable the POST Errors?

Thanks a lot