[SOLVED] My PSU CPU cable incompatible ?

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Solution
I am using the included cabels marked CPU from Seasonic

Ok.. I think you just don't know how those connectors work and are making assumptions.

But I think we were all a little scared when we built our first PC.

The "D" shaped pin is actually made to fit into a "D" shaped connection or a "square" connection. The "square" pin only fits into a "square" hole, so that is your "key" to prevent you from doing something like sticking a PCIe power connector into a motherboard.

The CPU cable is labeled CPU because it plugs into the motherboard to provide power to the CPU. All ATX power supplies made today have them and they're all keyed the same way. It's not like you got some weird CPU power connector that goes into a different...