I had the same thought after I reflowed the GPU from my iMac. It didn't work before, and it did work after, but it may simply be that dismounting and remountin

I had the same thought after I reflowed the GPU from my iMac. It didn't work before, and it did work after, but it may simply be that dismounting and remounting the heat sink put enough pressure on the cracked solder ball to make it work again. I will never know, short of xray inspection, but it's been working fine for half a year now.