I finally fixed my computer after three days of weird problems showing up.
The problem - CMOS battery failure. I would have been easier if it was just a matter of changing the battery but then the CMOS configuration was reset and it spawns other problems as well.

CMOS battery - replace battery #43 CR2032
mouse and keyboard not working - Check onboard USB configuration
monitor turns off suddenly - check onboard graphics configurations

Easy, but it has been years since I've last tinkered around computer tech hardware problems.