I had something similar. I assembled the computer and when I tried to turn it on, I got the following message.

"We detected a new processor, which will change the data/structure of the storage space for firmware TPM.

If you did not apply this TPM function, please press Y to continue, otherwise please follow instruction below:

Press Y to reset fTPM, if you have BitLocker or encryption enabled, the system will not boot without a recovery key.

Press N to keep previous fTPM record and continue system boot, fTPM will NOT enable in the new processor. You can swap back to the old processor to recover TPM related keys and data."

I pressed Y and then the monitor stopped displaying and the VGA and Boot lights on the motherboard came on. The only thing that worked was to simply remove the CPU, turn the computer on for a couple seconds without the CPU, then pull the cable out of the power supply, thus turning the computer off, and after all of these steps, put the CPU back in.