PC Not Booting Up

[mmcnugget4]

I bought an MSI x299 Gaming M7 ACK motherboard from a friend who upgraded (who sold the cpu) and bought an i5-7640x off eBay. After installing the cpu the motherboard turns on and immediately powers back off. The cpu remains ice cold. I have tried removing the memory, gpu, storage, flashing the bios, and still the same issue. I also have an Asus x-99 motherboard and was able to verify that the psu, memory, gpu, and storage are all working. I even tried, knowing it won’t work, installing a Xeon w-2123 that I had lying around, which uses the same socket but a different chipset and  the motherboard did actually stay on which makes me think my cpu is dead. I don’t have any other X-Series processors. I wanted to ask is my cpu dead or is there something else I should be doing or and I don’t something wrong? 

[Budget DIY]

Most likely ded CPU, less likely bad fren. Can anyone here be sure? No. More testing is required. (confirmed functional CPU for motherboard testing, confirmed functional motherboard for CPU testing)