Desktop Repair
Problem:
After Windows update black screen no display but num lock is ok.

Fast Solution: Re-install Operating system. done.
Another Solotion:
1. Checkdisk

2. Un-Install Latest updates

3. System Restore

4. Reset

Desktop Repair

Problem:
1. Bios Password
2. Bitlocker password and recovery

Solution:
1. Remove bios password
2. Diskpart, format then re instal new operating system.
3. Done.