Question Problem with new system

Jul 8, 2019
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Hi,
I have recently built my new Pc and getting this problem where my monitor suddenly freezes for few seconds then says no signal , my mouse and keyboard lights goes off and the small cpu light lits up on the Motherboard,
First this happened while playing minecraft , then second time another game and third time while using photoshop , Happened again twice while watching a youtube video

I updated my mobo bios before this was happening due to another crashing problem which is now resolved.

I lowered down the speed of my Ram to 2800mhz from 2933mhz in the xmp profile and even 2133mhz.

My cpu is not overclocked !!

Specs:
  • B450 Tomahawk mobo ( updated to latest bios version)
  • Ryzen 5 2600 with stock cooler
  • Sapphire rx580 8gb nitro+
  • 16Gb( 8*2) Corsair vengeance Ram sticks
  • Gigabyte 500w psu
  • wd m.2 nvme ssd
  • 1.5TB hdd

Thanks for any Help!
( I have noticed this all is happening after i updated my bios( new bios had support for 3rd gen chips)