not ready position

hi dear sir :

first things first i must congratulate u for ur useful website .

then i need some help to atart my turning lathe using fanuc 6MB
control unit :

when i start the machine i see the normal ram and bubble tests
display then the display shows not ready display and nothings work
with the machine and the axis normal display hasent been shown .

would u pls tell me whats the matter ?
there is nothing in the maintenance manual to describe
troubleshooting at this problem .

ill be very glad to hear from u as soon

best regards
a.m.esmaeel