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If the CPU won't work in a second motherboard and the motherboard won't work with a second CPU (and both test parts are known good) it does indeed sound like you have somehow managed to kill both your CPU and motherboard. Have you checked for any bent/broken pins on the 1700? Or for any dirt or debris in the socket? Have you tried resetting the CMOS on the X470 board? Did anything out of the ordinary happen when disassembling/assembling the build? Any drops, dings, components removed without disconnecting the PSU, etc.?