When you say "I did the new jtag by the way" do you mean alternate jtag points? If so, are you building your NAND image with a properly modified SMC binary?
I did the new jtag diagram using transistors, etc. Checked and double checked for the solder points. I used two nands, the first I had working (xbreboot 3 for falcon, the very same bin file that worked before) and the pre-made nands in this same forum. None of them worked.
This problem appeared when I was trying to close the xbox 360 and I pushed the dvd drive a bit strong. I am suspecting of the wires that perform the nand flashing, but the nand flashing goes great, so I canīt understand what is interfering to get the jtag going ok and not e79.