PC won't boot with USB UPS plugged in

[cmdwedge]

Good morning,

I have an Eaton 3S UPS which connects via USB to the computer. On my old Gigabyte 1366 motherboard, the system would boot normally with the UPS plugged in. However, on my new computer, if I try to cold boot the PC, it will hang on the BIOS loading screen until I physically unplug the UPS from the USB port - and the moment that I unplug it, the computer will then proceed to boot up Windows. I can plug the UPS back in after Windows is up, and it works normally.

Is it possible for a USB port to be disabled only for the bootup phase (UEFI)?

Asus Maximus VI Hero w/ latest BIOS
CPU 4770K
GPU Asus GTX 680 DCUII
8GB Corsair RAM
2x SSD
2x HDD
Corsair HX620 PSU

Thanks for any help you can give me! It's driving me crazy, as I cannot get Windows to talk to the UPS without the USB plugged in - so no graceful shutdowns like I used to have on my Gigabyte board.

Cheers.

[Corsair_Riker]

What is the current setting for CSM (Compatibility Support Module) in your BIOS? Might be worth trying to change that to see if it fixes it.

[Cricka]

Did anyone find a solution to thiis?
I have an Eaton 3S UPS that when connected with usb prevents the pc to boot..

[pills]

Have you tried testing it on other usb ports? Also under boot order in bios try disabling all boot options save for your c: drive or os partition.