Question Random restarts during idle

[Legolas_grnlf]

Hello guys, I've been getting some weird restarts and non-responsive scenarios during the last few days. Only happens when the PC is not under high load - monitor goes black, it says No Display and either stays like that until I do a hard restart or restarts itself. Machine has been stable for the past 5 years, no issues whatsoever and suddenly this happens. I've tried all I can think of without disassembling everything - update BIOS, DDU and fresh install of Nvidia drivers, checking all the cables, temps are absolutely fine, everything is seated properly... Honestly I am at a loss.

Specs:
CPU: i7 11700k
GPU: ASUS TUF RTX 3070
MOBO: ASUS ROG STRIX Z-590
RAM: G-Skill Trident Z RGB 4x8GB 3200 Mt/s
PSU: bequiet! Straight Power 11 850W

 

[Linkedchainz]

What is the Reliability History report showing? problem for awhile?
Event Viewer could help you breakdown to see if its due to a bugcheck (and it would give you a error code)