Black screen with cursor after logging in (win10)

Hello,
I Have Dell inspiron 15R N5110. Have been seeing a black screen with cursor after login to windows. I rarely see the desktop but after leaving the laptop turned for long time, maybe hours. But when i click on my computer or pressing ctrl + A it takes secs or even mins to respond, and doesn't reapond if i tries to open my computer or anything.
I tried the diagnostics on the startup and found the following results:
Error code 2000-0333
Validation 61893
Msg: video-user provided no input for graphic test

Another msg

Error code 2000-0142
Validation 25486
Msg: Harf drive O-S/N WD-WX41E4131137, self test unsuccessful. Status=7

I dunno what is the problem exactly

That sounds like the hard drive is failing, and Status=7 is a failure on WD drives. Hope you have a backup. You can run chkdsk to check and possibly fix, but I've always heard that once they are going, they are going. I'm no expert though, so YMMV. Someone more knowledgable than me will probably be along soon. But, I'd be wanting my files off that drive if I didn't have a backup already.