MiniBook X N100 don't start

Hi,
What is the procédure to force “deep re-start” or “safe mode” start
on MiniBook X N100 ?

I try to start with F7 key clicked
but no result

i think this issue is linked to sleep settings

Does some one can tell me what this hole is for please ?

I had a similar issue and could restart by (very) long push of the power button.

be sure that i have already try it
when i try a long push
result it’s turning off the blue led

but when i click again blue led turn on and nothing more …

Please note that I use my MiniBook X as tablet PC
physical keyboard folded at the back
with a BT mouse and using the visual keyboard

i suppose that is why the physical keyboard don’t response now …