E6500 numlock flashinig, but CPU is fine, now what?

Flashing numlock LED (other two on) indicates: "possible processor failure", but my CPU turns out to be working. I replaced with a same CPU from a second working E6500 – and it continues to fail to boot with the same symptoms and flashing numlock. So I put the CPU from the first E6500 into the second, and it works.

So wondering what else to troubleshoot. I love this particular laptop and really want to get it running.

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E6500 numlock flashinig, but CPU is fine, now what?