Turning on a HP 41 with the HP IL module plugged

[aurelio]

Thank-you, both you were so fast in answering, and I so poor in details.....
before to post my situation I've performed a few tests checking if the behaviour depends on the loop, opened (broken), closed, with and without the third hardware (PILBOX) inserted. I took away the HP 82160A module plugging it into another machine, with the same delay (open circuit), then back again in the first calculator, always turn on delayed, then at the third attempt the situation is restored..