It's definitely the motherboard. Excessive heat has weakened the solder joints and most likely damaged one or more of the chipset. Dealing with the YLOD is a never ending headache.
The problem is that the YLOD has no permanent fix. You will keep making temporary repairs until it can't be repaired anymore.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.