@hcsch The most evil BIOS I used required you to press the key exactly once. More than that and it was a keyboard error after which it was no longer possible to enter the BIOS settings without resetting the computer and trying your luck again. The same may also have happened if you pressed the key too early (I can't remember). At least once the BIOS printed "entering setup..." for a split second and still didn't go there. It didn't help that my screen at the time was also slow to wake up.