my laptop screen goes blank very often

Hi,

I have been facing a problem during the last few months. In the morning after turning my laptop ON, the screen remains blank except that my cursor arrow is visible.  it takes a very long time ( may be 25 to 30 minutes)  to boot. Even after the screen appears and I enter my opening password, the screen goes blank again. Finally it opens up but I cannot work with the system. When I press the key for re-staring, the restarting message remains on the screen for quite some time. Yesterday, I could not use my laptop for almost 5 hours because of the problem. Finally, everything was fine and I am able to work. I loaded WINDOWS 10 some months ago and I get a feeling this is happening more often after I starting using WINDOWS 10.

If I press control-alt-delete keys on my key-pad, the list of actions get displayed on a blue screen giving the standard choice of task manager, The screen goes blank again if I press any choice.

Whenever any normal downloads like WINDOWS updates , etc. are in process , clear message appears on the screen and at least I know. The updates take sometime to get un-loaded and thereafter I have no problem.

I fail to understand why the system goes blank but becomes alright after several hours. Probably it tries to recover something? Why do I not get a message as to what the system is doing internally?

What action do I take to understand what activity is going on inside my laptop, so that I can either re-schedule the data recovery process so that it does not hamper my work schedule?

Any lead will be useful.

Amitava