Black screen

Here is what happened.

First I reinstalled the windows because I wanted to run the program that you suggested. My disk passed the short test but after couple of hours running the long one the computer crashed and I couldn't go back to the windows again...there was scanning my disk but windows restarted all over again...scanning - restart, scanning - restart...

Then I applied termal paste like in the video and turn on the computer again. Computer wasn't so loud then before, there was a big difference in loudness and I also get into the windows. Program scan continues but after a while there was crash again and I am on the beginning of this post...system is scanning my disk, computer restarts and there is scan again...if I get it right system couldn't scan my disk. But month or two ago this scans was every time I turn off my computer and then turn it on again.

So is the reason for all of this my disk? Do I have to change it?

Thanks!

I still didn't received the answer...