When the laptop is acting funny and starts one day and is showing a blank screen on the other day, then try these
Press the key F12, Esc or Delete. When this step doesn’t work, go to the next step.
Maybe this problem is because of any virus in your laptop. You can wait for the laptop to load and do a full antivirus scan. Use CCleaner after the full scan. When even this does not work out, try the next step.
Reinstall the Windows as it would take a lot of time to solve this issue. Take a back of the important files and reinstall.