Bingo, die F2-Taste war´s ...
Acer: - Ctrl+Alt+Esc
ALR PC: (F2) or (Ctrl)(Alt)Esc)
AMI BIOS: (Del), (F1) or (F2)
AST, Advantage, Award, Tandon: - Ctrl + Alt + Esc
Award BIOS: (Del) or (Ctrl)(Alt)(Esc)
Compaq: (F10) (do this when the cursor is in the upper right corner of the screen blinking)
Dell: - F1 or Del.
Dell: - Some require pressing reset twice
Dell: - Ctrl + Alt + Enter
DTK BIOS: (Esc)
Gateway 2000: - F1
Hewlett Packard: - F1
IBM:
Older Models - In order to get into the configuration of the IBM setup screen (CMOS) screen you need to hold down both mouse buttons during bootup.
Aptiva - Press F1
IBM PS/2: (Ctrl)(Alt)(Ins) after (Ctrl)(Alt)(Del)
IBM PS/2 with reference partition: - Press Ins during boot
Some PS/2s, such as 75 and 90: - Ctrl Alt ?
Some PS/2s when pointer at top right of screen: - Ctrl + Ins
Leading Edge:
Fortiva 5000 -
NEC: - F2
Packard Bell: - F1 or F2
Phoenix BIOS: (F1), (F2), or (Ctrl)(Alt)(Esc)
Phoenix BIOS: - Ctrl Alt S
Phoenix BIOS: - Ctrl S
Phoenix BIOS: - Ctrl Alt Ins
Sharp Laptop 9020: - F2
Sony: (F3) while you are starting the PC, then (F2) or (F1)
Tandon computers: - Hold down the key after turning on power
Tandon: - Ctrl + Shift + Esc
Toshiba Laptops: - Toshiba Utility
Toshiba: - Press Esc during boot
Toshiba, Phoenix, late model PS/1 Value Point and 330s: - Press F1 during boot
Olivetti PC Pro: - Shift Ctrl Alt + Num Pad Del
Miscellaneous PC's: - Ctrl + Esc or Ctrl and Alt and +
Zenith: - Ctrl Alt Ins