Windows 11

How to Fix Keyboard Not Working on Windows 11 Quickly

Match the symptom first: BIOS or another PC means Windows; failure there means hardware. Then follow login-screen checks, driver fixes, Fn lock steps, and hardware tests.

Windows 10

How to Fix Windows 10 Not Booting: Safe Repair Steps

Match the exact boot failure first, then use the least risky repair for a black screen, Automatic Repair loop, or no boot device error.