system boot problem

Hello, I have purchased a brand new PC (only cabinet part) in September 2020. Configuration is as follows, Intel core i3 9th gen 3.6 Ghz Gigabyte H310 Motherboard WD 1TB Sata Kingston 8gb ddr4 ram Nvidia 2gb GT710 Inno3d Artis Cabinet and smps It's having a weird problem. When I start it...

So, about 2-3 weeks I've had problems with my PC booting. The problem began after I re-installed my Windows. When it turns on it immedietly turns off before showing a post screen and then cycles on and off about 4-5 times. After that it starts normally and the system is usable and I have not...