I recently ordered two used Xeon E5-2667v2 on EBay and installed them to my Z820 Workstation which was running two E5-2687w0, I tested both CPUs individually, one at a time, and both CPUs installed together, with and without RAM installed. In all cases the machine would not POST and would ramp up the fans to max speed with a solid blue light in the back. I have tried clearing the CMOS and switching the recovery jumper with the new CPUs installed, and with the old CPUs installed as well. I have also tested with multipule diffrent GPUs with the same outcome.
I've pretty much tried everything I can think of but the seller insists the CPUs are not faulty. The new CPUs appear in visually excelent condition. I have no other machines or boards that could support these chips for testing.
The workstation was fully functional prior to installation of the new CPUs and is still functional after replacing the old ones, and is running the latest BIOS 3.94 Rev.A