Ive just encountered the blue screen of death boot loop. Mine stops when I remove the proximity /camera cable . It will even jump out of the boot loop if I remove the cable while its on ! . Interstingly I can put the cable back on and its fine until turned off - then it boot loopz again, I have to pull the battery and cable.
I didnt get the screws wrong so unless I overtightened and tore the nut from the board a touch I cant see how I would have a short problem there.
Next step for me new proximity camera sensor