I have recently bought the EVGA z490 Dark a few days ago. I plugged up everything and when I power it on, all the components work, gpu, mouse, and fans. But, unfortunately it is not showing anything to my monitor. I don’t know what else to do.

jjcuh
And memory dimm 1 and dimm 2 LEDS are showing red as it failed POST

That is exactly what is going on. Memory is having issues. Try clearing the cmos.

jjcuh
I did that many times and it did not fix it. I tried to update the bios but error code E3 stops the process. I tried a different set of memory and no luck….

Try only 1 stick of ram in various memory slots

With one ram stick it can show display, but two sticks show error code 4C. I tried a different set of memory (2x32, 3600 g skill), and i got the same result. Changed the ram to different slots and two cannot work, only one memory stick. 

Make sure you don't try fix those pins yourself if such issue is present RMA the MOBO. There nice powerful board I got one and love it. some great help is going on here.