Computer would turn on but end up with a black screen (lights on the motherboard were on). Swapped monitors and made sure each monitor was doing the power on self test. Both monitors were ok.
Stripped the PC down to just the motherboard, processor, and power supply. Was expecting beep codes but the board just lit up and seemed ok. So I couldn't really tell which component was causing the problem.
Returned both memory sticks (and this was my error). Still tried to see if there would be a change in the monitor screen, but still just a black screen.
Decided to go the the computer repair shop. Technician was excellent. He retained one memory stick and the PC was finally able to boot up and reach BIOS. He tried to return the second memory stick and the black screen problem returned.
Was forced to upgrade to two 8 GB DDR4 memory sticks since they no longer sold 4 GB DDR4s. Sales person said that I could run the 4 GB alongside the 8 GB, but that the two would settle for the lower frequency. So instead, just bought two new memory sticks for better performance.
God is good. That was still cheaper than having to replace the motherboard and processor.
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