What is the likely culprit for an intermittent startup crash on a Ryzen/RTX PC?

[LoganZW]

I built a new gaming PC last month, and for the past week, I've been getting a consistent crash on startup where the system freezes at the Windows loading screen, forcing a hard reboot. It usually boots normally on the second attempt. I'm running Windows 11 on an AMD Ryzen 7 with an NVIDIA RTX 4070. I've tried running the Windows memory diagnostic tool and updating my GPU drivers, but the issue persists. For anyone who has solved a similar intermittent startup crash, what was the most likely culprit? Should I be looking at faulty RAM, an unstable BIOS setting, or a potential issue with my SSD, and what's the best step-by-step process to isolate the failing component?

[William_R]

From my experience, intermittent startup freezes on a Ryzen/NVIDIA system are most often due to RAM stability, BIOS/UEFI settings, or the storage drive. Start with a clean baseline and minimal hardware, then rule each big candidate out one by one. Steps you can try this week: 1) back up everything, then reset the motherboard to defaults (load optimized defaults) and disable any aggressive features (XMP, overclock, PBO). 2) test RAM modules individually with MemTest86 (overnight if possible); if you see errors with any stick, that’s your culprit. 3) reseat the RAM, GPU, and all power cables. If you have multiple drives, unplug non-essentials to see if a failing OS drive is the cause. 4) check the OS drive with SMART data and health tools (CrystalDiskInfo) and run CHKDSK /f /r from a recovery environment. 5) once basics pass, enable a single 4–8GB ram profile and boot. If it still crashes, flash a latest BIOS and re-test with defaults again. 6) if you suspect storage, try booting from a spare drive or USB and see if the problem repeats. 7) as a final check, boot to a Linux live USB to see if the crash happens there too—this helps separate Windows driver issues from hardware faults. 8) keep a notes log with timestamps, what you changed, and the result so you can spot patterns over several boots.