Just an update:

Two of the machines are working again!

If you are having the same problem/s this is what I did:

I followed the instructions of the reset suggested above, but this time a little different.
I was clicking the button 5 times quick, so now I clicked it 5 times about half a second apart, waited 4-7 seconds (I was counting in my head, no stopwatch :p ), pulled power, again did the clicking, again pulled power... checked on Angry IP and found the damn IP!

I hope this helps someone in future.

Cheers!