I would believe that the GPU would be at fault - it might have overheated due to the fan coming apart. If you have another GPU to test, that would confirm it.
I don't have a spare so I will have to buy one. The XLR8 has its own fan. I had to install it upside down. The fan was found resting on the GPU and leaning against the CPU fan. Could the fan cause a short and kill the GPU? Is it possible that it did something to my power supply? If a GPU is dead and plugged in, would it shut down the CPU and disable power until removed or replaced? I ordered a LED Power Supply Tester to check my power supply in case the fan was damaged.