I have a hp 8000 ssf USB ports work well with flash drives but when I connect USB keyboard and mouse it does not work. USB voltages are okay and I checked all front and rear ports.
ps2 keyboard and mouse works well too.
I flashed bios ic with a working dump but it didn't help
anyone had the same problem ?

Try https://support.hp.com/sk-en/document/c01941946

it didn't help