asrock x300

I've bought Asrock x300 deskmini pc with AMD Ryzen 3 2200g apu and one stick of memory ( https://www.varle.lt/nesiojamu-kompiuteriu-atmintys-ram/nesiojamo-kompiuterio-atmintis-kingston-8-gb-ddr4--6457538.html) and it would not post at all and no display i was wondering if its that it is a only...