Question Need help motherboard not detecting cpu

Feb 20, 2019
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I've recently bought new components I wanted to reuse the motherboard+cpu combo I've used before in my old system it is the ryzen5 1600+ b350m gaming pro I had no problems with them in my old system but after i was done rebuilding the system without changing anything from the mobo or cpu still in their old place i get the debug lights from the motherboard and in the manual it says the motherboard doesnt see the cpu what could cause this problem? Thanks in advance
 
Feb 20, 2019
2
0
10
old system:
Ryzen 5 1600
B350m gaming pro
Gtx 1070 msi
650 w power supply
16gn ddr4 3200mhz
500g ssd

New system:
Ryzen 5 1600
B350m gaming pro
Gtx 1060 msi
650w power supply
16gb ddr4 2400mhz
1tb m.2 970 evo