Question Pc wont output signal

Jun 12, 2021
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Recently i build my first PC
Pc specs:
Ryzen 5 4650g
Gigabyte Aorus B450 Gaming Pro
2x Teamgroup T-Force Delta
Evga 45W psu
The problem is the system won’t pass the red light on the motherboard for DRAM.
Ram is fine I checked with another conputer.
Could it be the motherboard, because when I plug in my mouse the lights don’t turn on?
Is it possible that it is the cpu, but i am not sure since the red light isn’t turned on for the cpu.