I've had a disaster. I'm upgrading a Mac Pro 4,1. It's been flashed to 5,1, and the EFI has been updated to 144.0.0.0.0. The gpu is an RX570. It is happy to run Mojave. I've bought a dual cpu tray to upgrade from single. Before I updated the EFI to 144.0, I put the new (to me) dual tray in the machine and it booted. I then started to upgrade the chips to 5680's. I'm trying to upgrade without de-lidding the chips. I first updated the EFI to 144.0.0.0.0 from where it was and then while trying to guide the heatsink in place and get the fan connection I had to raise the heat sink after placing it on the new cpu. The result was that the chip adhered to the heat sink, but then dropped into the socket. Now, with the old chip reinstalled on the dual tray and everything on the dual tray back the way it was the computer will not boot, and the power light keeps flashing. Remember, since it last booted with the dual tray I updated the Boot ROM. I've put the original single cpu tray in the machine and it works perfectly. I'm tying this on it. So, is it a compatibility problem between the dual tray with the old chips and the updated EFI, or does it mean that there might be damage to the socket caused when the chip dropped into it. I've checked all the pins under a light with magnifying glass and none look bent. Help!!!!!