Motherboard don't detect cpu and ram?!?!

Aug 22, 2018
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Hello, I have problem I got ryzen 5 2600x
Mobo MSI x370 sli plus and ram corsair cmr16gx4m2z3200c16.
Gpu msi r9 390 8gb
Problem is when I push power button all fans spin and I have on monitor black screen.
On motherboard on debug led cpu and ram fail to start or not detected.
I do everything cmos, battery,check cables,cpu,ram.
I think I need update bios, but I can't because black screen on monitor.
Your suggestion guys?
Please help.