System not booting

Aug 4, 2018
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I am using a ryzen 3 2200g with an asus prime b350m-k motherboard with 8 gb ddr4 ram....a few days ago, i found that in the bios,my ram frequency was set to 1866mhz when actually it was rated 2400mhz...So i overclocked the ram to 2400 mhz. After exiting the bios, th screen went black and now the system won't boot.the monitor just turns on and then displays"no signal".....pls help me.what can i do?