I have never thought that a keyboard can slow down the boot process of a PC, but apparently my Dell AT101W does exactly that. After turning the PC on, the screen is completely blank for ~5 seconds, after that the keyboard is initialized (the keyboard LEDs turn on and off) and the boot process continues as usual. If I plug in any other PS/2 keyboard, it's initialized immediately after turning the PC on, without any annoying delays.
Is it normal? Or something is wrong with my AT101W?