Cannot access Boot_admin on 712/60

[iENZ]

Hi out there!

I need to access my boot_admin menu on my 712/60.
I tried pressing the 'Escape'-Key now a hundred times:
Constantly, repeatedly, after the Keyboard's LEDs blinking, from the start and all possible combinations.

Is there any way I could have locked out myself?
Or is my machine somehow damaged?
I have tried 2 keyboards now, one genuine HP and one from Cherry, so it's not the Key itself.

Big thanks for help !!?!

 

[hiwaycool]

Try ctl-b

 

[iENZ]

Ctrl-B didn't work out, so I used the 'brute-force' method:
Unplug the Harddisk and Lan so the machine has no way to boot. Now the console comes up automatically.
And: I really locked out myself --> Security was ON

Thanks!