Looks like you got one of the common problems that this card is known for and the only way to fix it is to replace the bad inductors so basically right now as it is there isn't enough power going to the gpu from the power vrm on the card. So it is bricked till someone decides to rebuild it. R45 to R60 is a safe range judging that the same works very well with the 280.
Yes I forgot! You are completely right. @ OP: I would definitely look up the inductors/VRMs.