After trying what Tech suggests.
If that doesn't work, do you have a spare PS2 keyboard or perhaps borrow one and see if it works with that. You can't just plug in a PS2 keyboard and it will work, it requires a reboot to be recognised and enabled.
David,
Keep in mind new motherboard makers are not going to include the PS2 for mouse and keyboard into their new future board, only USB and I have already seen new motherboard out on the market so far I've seen ASUS and Gigabyte check their website.
Goodbye the old PS2 connection and move on to the future.
Keep in mind that I'm just a humble avast user like yourself and not employed by Alwil, I'm just trying to work with what we have also.
But, we are talking about your existing MB which will probably have the Legacy ports, PS2, etc. The reason for suggesting it it just for confirmation that otherwise there is no problem with the boot-time scan. If it didn't work even with a PS2 Keyboard then the problem could be greater.
I still use a PS2 KB I got fed up with hiccups with my wireless USB KB and I never used any of the additional function keys, did try the sleep, but that was more comatose than sleep.
Whist some MBs will phase out the legacy ports, I feel they will still be available for some time yet and at that time I would like to hope that support for USB Legacy devices would be better. As Vladimyr USB devices should work in BIOS Legacy mode, assuming that this option is enabled in the BIOS. You have no bells and whistles just basic function, but your keyboard isn't even getting that far I assume because of the "Keyboard Error"
I don't know if you have swapped USB ports to see if that makes any difference.