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4,1 CPU Upgrade -> Fans racing, CPU B's fan or thermal diode not detected

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Hello folks! I was doing a CPU upgrade on my 4,1, and I think something has gone wrong on my CPU B's fan connector, or something else. The fan on the heatsink isn't spinning, and the thermal diode isn't recognized.Have I fried it some how? I'm pretty sure its made full connection, as I can't seat it any lower.

Here is a pic of iStat menus View attachment 626269

No Booster B detected.

Also, here is a picture of the fan connector
View attachment 626270

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