HP ProBook 4540s 4545S Power Button Board With Cable 683486-001
Pulled from a tested working laptop
Part #'s on part:
683486-001,
50.4SJ01.002,
504SJ01002,
50.4SJ01.012,
48.4SI03.011,
48.4SJ03.011,
11797-1,
11806-1
Compatible Models:
HP ProBook 4540s 4545S