Hey comrades, i have a b450m pro vdh plus, it beeps when there s no ram but with ram cpu light comes on and thats it. I tried different bioses ifferent cpus and ram sticks nothing ve helped .

Try to update clean BIOS firmware from motherboard site 1st.
Then u should to check SPD from any DIMM slot.
And if u have a DDR4 tester to chek all lines between socket and all dimm slots. It's shows usually a socket's line/pin defect.

Better for u to look datasheet for any vendor DRAM (ex.Micron) and find power sequence diagram.