Thanks It was indeed a button to press for takning the top cover off, never seen this one. I dissassembled the miner and all the hashboards look fine no lose heatsinks. im leaning towards psu, as it happend simutaniusly.I conclude that  theres power to the boards and fans, but its not powering up hashboards. Should be a separate power circuit for the boards. I have another, a T17 that lost one (occasionly one more), but controler detects the faulty board, some data as voltage is shown, and also a asic count before powering it off
ill disassemble the psu to check if theres any visual damage, dont know anything about testpoints or so, would appreciate any suggestions for where to search.