When your computer is started and then PC (Laptop or Computer) screen is black for 4 or 5 minutes.
How to solve it
If the issue has already occurred (stopped at black screen) recover as follows:
Step 1 : Press Ctrl+Alt+Del keys
Step 2 : Click Task Manager
Step 3 : Click the Services tab
Step 4 : Locate and right click App Readiness in the Name column
Step 5 : select Stop from the Menu
Step 6 : Follows the steps under the Prevention to prevent the issue.
Note : » (a) Install HP image enhancement for your System.
(b) You can also update your Windows.
Source : HP Computer