Windows 11 Green Screen at Startup or BIOS Abnormalities

Upon booting the computer, a green screen appeared. Troubleshooting based on the prompts suggests it may be caused by intermittent hard drive failure or BIOS settings issues. After multiple restarts, the system unexpectedly recovered to normal operation, though no BIOS settings were modified. Currently concerned that the issue may recur after shutdown, and suspecting a system bug has locked the C drive. Seeking safe troubleshooting methods and preventive measures.