I took apart my st10+ to repair a split in the case front. This involved lifting the main boards which I did carefully and got it all back together then devided to test by connecting the battery with the back off, but now it doesnt start. the screen says yuneec briefly then goes off and this happens repeatedly. Eventually when i turn it off again, a tiny orange led glows in the main rf board (shown) and a red light glows above the power switch and a single beep sounds. Im wondering if I damaged or failed to connect the micro ribbon cable shown. Can anyone advise please? Also what is the tiny round sensor at the bottom of the case that sits in a small red plastic holder??