Windows 10: My Laptop screen won't stop turning off :(

I've legit tried everything I can think of to fix this problem. My laptop screen refuses to stop turning off. I've changed all my power options to Never for timeouts, for plugged in and not plugged in. I've went to the advanced settings for my power options and put never on all of them and nothing worked. I also made sure that my screensaver was moved to None instead of blank. And yet, every 10mins my computer screens goes black. This is a huge problem because I got to sleep with my computer plugged into my tv and I can't go to sleep without the noise and light from the screen. But after 10mins it always goes out. Now I did mess with a few things in the BIOs around the time this happend but I've already reverted those settings back to default and the problem still hasn't been solved. Not only that but somehow my computer restore points got deleted so I can't even go back to an older point in my computer before this started happening, which was about 2 weeks ago. Does anybody know what I can do to solve this.?? Its been driving me crazy

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Windows 10 problems.

I have been experiencing some problems after I upgrade windows 8.1 to windows 10.

1)If I use my laptop more than one hour , when I try to turn it off the screen turns off but my switch on button indicates it's still on. It never goes dark until turn my laptop of forcefully(keep pressing power button for long).

2) If I leave my laptop doing nothing as usually the screen will sleep. But when I try to turn the screen back on, No matter what key I press it won't turn on. So I have turn it off forcefully again and turn it on.

3)If I have updates they won't download.

 

Unable to turn off full screen start menu and switching off tablet mode didn't work. Does anybody know if there is something else blocking it?

My laptop has switched to full screen start and I can't turn it off. I was accidentally on tablet mode but I've changed that and it still won't turn off the full screen. I've restarted a couple of times but no luck. Any other suggestions?

 

Also I have a Dell laptop, Windows 10