Talked with Luke today and he confirmed the handset wasnt powering up on HEQ5 pro, he loosened a few cover screws mebbe on Mboard as well and all worked fine so an indeterminate intermittent short. Suffice to say he is shipping off a brand new replacement HEQ5 pro mount tomorrow, apart from lost time and one freight cost Im happy with outcome, he also said its the 2nd second hand heq5 this week with similar prob so its all anyones guess...