Akai S1000 / S1100 samplers

Hi,
I'm hoping someone migt be able to advise me on how to unlock the operating system on 
my S1100. I haven't used it for about six months and when I recently turned it on, the first 
screen freezes and does not progress to the next screen. None of the buttons work either. 
I tried turning it on and off a few times but without any luck. My disc drive also does not 
work - so reloading the o/s - is not an option.

Please help! as I love my S1100!
Axiom