MSI Z370 gaming PLUS won't boot after bios update.

[linustechtipscom]

my mate recently built a PC and after a couple months it kept turning off (only for first 20 mins and then worked normally). We thought it was either bad PSU or 24pin not making a good connection with the motherboard. or maybe power issue with power switch. We checked all this and none of this fixed the issue. 

After reading about it online people suggested that we should update the bios. So after bios completed updating, PC restarted and there was no video. We left if for good 10 minutes and nothing was happening so we force restarted it. and nothing

we almost tried everything we could think of and still no video:
Cleared CMOS
moved the ram to different slot 
removed the drives
connected one monitor to motherboard and one to GPU
removed the GPU entirely.
tried bare bones boot 

part list 
CPU - 8600k
Motherboard - MSI Z370 gaming PLUS
PSU - EVGA super nova G2 650 watt
GPU- Gigabyte RX 580 Gaming 8G

what do I do?/ any help is appreciated.

[Fasauceome]

Have you contacted customer support? I know MSI is known for having crap tech support but it's worth a shot.