Wont boot up

Jan 26, 2019
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Just done a new build
Ryzen 7 cpu
Gigabyte b450 pro wifi
Team vulcan ddr4 2x8 gb ram

It dont seem to boot up lights and fans all comming on in order, getting a beeping sound from system speaker 2 beeps followed by 4 beeps.
Read up and it means ram problem now i bought the ram as 2 seperate modules and not as a 16gb pack and have tried each one seperate in slot 1 same beeping sound. Any ideas i have striped system down and reconected all components again.