Desktop Boot and Lockup

The problem revolves around a pre-operating system password set in the BIOS that requires entry before the computer can boot. I have a USB-attached Cherry G80-3000  keyboard, which, upon the initial power-up from cold, all three lights (numlock,capslock and scrolllock) flashes briefly but the keyboard then fails to function. no keys work, (Caps lock/num lock/scroll lock do not turn the indicator lights on)
Consequently, I am unable to input the password.
However, here's where it gets interesting – if I power off the computer using the front button and then power it back on again, the USB keyboard is identified and functions correctly. This workaround allows me to input the password and proceed without any issues. Having to turn the computer on and off then on again just to enter the passwoed is a bit tiresome.
The problem appears to be that from a complete cold boot the BIOS is not communicating with the keyboard propery but on a semi-cold boot the keyboard is identified correcty.
I am guessing that this issue is getting masked from other users because perhaps not everyone has a bios password set before the allowing the boot process to continue. Once the operating system takes over then this would take over control of the usb keyboard and everything would appear to be ok.

This appears to be a bug in the UEFI bios. On my previous PC (HP Z2 G4) it was configured exactly the same but there was no problem.
I have tried all the USB settings in the bios and it makes no difference. The problem only occurs from a complete cold boot (e.g. powered off on the wall left overnight then powered back on).

Hope someone can help

many thanks.