Black screen after adding RAM?

My Specs

Mobo: Gigabyte Z370 HD3P

CPU : I7 8700k

GPU : Radeon RX 580 Sapphire Pulse

My problem : Dual boot system [Mojave/Win 10 ] boots off a clover USB stick. I planned to add a hard drive and double my ram before starting a new job.

Added the two ram sticks and it wouldn't boot to Mojave. Windows loaded fine and recognized the ram at the proper speed.

I tried to put back the two original sticks in their original slots and now I am getting no output to the monitors. I have no idea what could have happened. I didn't touch anything but the ram. Any ideas how I would troubleshoot this? Everything 'sounds' like it's working normally.

Thanks.

submitted by /u/srabadan
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