New MSI Z370 A Pro not display,no boot, only Debug LED blinking between CPU and RAM

Feb 19, 2018
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I am build new PC, is outside of case, components are :
MSI Z370 A PRO,
i5 8400,
RAM HyperX Predator 16GB, 3000 Mhz 15CL / one stick /,
Seasonic S12ii-520W.
also I have DVD writer, SSD, FW PCI-e ,these are not connected. I have connected PWRSW cable from case to JFP1 pin 6-8 and CPU fan with i5 and RAM in DIMMA2, 24 pin ATX to Mobo and 4+4 pin to 8 pin CPU PWR. I have connected LED Monitor in VGA onboard. When I turn on machine, the CPU fan is going, no boot ,no display, only DEBUG LEDs are blinking between CPU and RAM.
I tried to CMOS reset, RAM reinstalling to all slots, reinstall CPU and fan,looking for bent pins on socket. Everything looking all right. I dont know what to do.I wrote to MSI support for compability with HyperX and thats ok. Please give me some new ideas guys .Thanks
 
Solution
You did all you could at this point. Next step is trying to swap parts for another ones - starting with RAM. CPU is next, and mobo is last (although less likely but possible).