My PC can not detect my second slot of RAM.

[Microsoft Windows]

My motherboard is Gigabyte F2A78M-HD2 with two RAM slots.My problem start after my power supply stop working I take my PC to service after a week my PC was ready to be use with installed new Windows 11 Pro 64 bit .but when I get home and power up my PC my RAM was only 8GB before to take my PC to service was 16 GB two RAM sticks 2 x 8 GB 1600MHz . I go to the bios to check why my PC is use only one RAM stick. The values on one of the RAM sticks was with very low values compare to working RAM stick (both RAM sticks are same model) is like PC is not recognize it. I ring to the service to ask them

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