Question PC won't start after chaning CPU.

Apr 8, 2020
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Hello!
I got new CPU today I7-9700K, before that i used I5-7500. When i try to start my pc lights turn on and fans and after 1s shuts down. I checked if my RAM is placed good at it was, and i reseted my BIOS settings to default. Does anyone know how to fix this?
I'm using Mortar Artic H270M motherboard.