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I have seen this issue before, but not related to a processor, it is very uncommon for a processor to fail this way, since a processor either works or it does not work.
At this point I would suggest running the Intel processor diagnostic tool to determine if there is an issue with the processor:
Also you can run the Intel processor identification utility to determine if the processor is being properly recognized:
If the issue follows the processor, the please contact your local support center at:
Or start a chat session at:
Thanks Adolfo, that's really helpful. I'll have a go at these tools this evening and let you know how I get on. Like you, I don't really think it's the processor, but having tested every other component, and had the motherboard replaced, it's really the last thing left to test.