chip could be heat-damaged now, it's happened to me.
in my experience, once a chip has been at super-hot temps (due to a lack of or improperly-seated heatsink), it can sometimes only survive at unsustainably low temps without locking. It sucks, but you might be able to rma the cpu and try again. I have had that exact experience with installing and locking in this situation.
Either that, or incompatible memory. Some brands don't work with some boards. Some people might say 'bad ram', but it's really just incompatible.
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