Help me about black Screen in laptop

Hello dear
I am Using Windows 10 Pro
And I have A Laptop having following Specs :
Processor: INEL (R) CORE I5 - 2520M CPU
RAM: 4: 00 GB
64 BIT OPERATING SYSTEM
And I am using office 2016 so problem is that
Yesterday I worked with two word files and during my work My laptop's screen went dark black and after some seconds it turned off completely,
I then Restarted and worked normal but after only a few minutes, This happened again
And I started it again , and resumed my work in word, But after 10 minutes it again shut down.
Then I started and up to now it works normally and fine,
I want to know that why this problem occurred
It occurred some times before , then I changed windows but still not resolved
Can you suggest my any solution for this problem
Actually I am a composer and when laptop shut down Accidentally my all unsaved work is going , and then I composing it from beginning
Problem is that (laptop's screen is going black and some small color lines are blinking at left side)

spunk said:

Go to the HP Support/Download Drivers site for your model : HP Software and Driver Downloads for HP Printers, Laptops, Desktops and More | HP® Customer Support Choose Windows 8.1 (the latest version available) and whether your OS is 32bit or 64bit.
Download the Chipset driver and the Driver-Graphic video driver for your model. If the behavior continues, the Video chip on your motherboard may be failing and the motherboard or the screen may need to be replaced. Contact HP Support.

You Are Right Sir,
But there is no option for windows 10 there on HP Site
And I am using Windows 10, So what do Now

bro67 said:

Do as Spunk stated and download the Windows 8.x drivers. Otherwise in your case, it sounds like your Elitebook is failing and you need to send it off for repair.

I installed only Chipset driver , provided in that page
But I didn't downloaded graphics card driver because there was only AMD video graphics And I have Intel HD Graphics 3000
so now my Problem Should solved OR Not????

Here is the Intel website for your Intel HD Graphics 3000
Downloads for Intel® HD Graphics 3000
However, you will run into the same problem you have discovered, there isn't a Windows 10 driver

In the Intel Core Processors, this page shows No for Windows 10 Intel® HD Graphics 3000
Supported Operating Systems for Intel® Graphics Products

I don't know to explain this in exact detail but from what I've read
Vendors are discontinuing support for legacy products in Windows 10 as time goes on