Hi! I had one realy hard problem. My pc just when I gaming or doing common things just black screen and wont again boot into bios....I have a light on motherboard and when this happened this light just blinking and pc constantly restarting unit I unplug power cable and replug in and then work normaly. this happan just a very sometimes....My rig is: asus x570 tuf gaming, amd ryzen 7 2700x oc 4 ghz, 16 gigs ram 2933 mhz (costom timings, default just dont work)l, water cooling, 2 tb seagete ssd, samsung m.2 ssd, kingston 500gb m.2, gigabyte 500gb m.2 (pci adapter) and asus 1080 ti. I also cant get ram on 3200 mhz, bacause just dont boot...only on 2933 with costom timings work. my psu is 700w with adapter for additional 4 pin on motherboard. I realy dont know what is it? I tried all to diagnostic and test and always same story...my temps are ok. only gpu is on 85, but this is normaln for blower fan gpu. cpu max is 70-75...ram and motherboard are fine (max 50). TNX for help!!!!