My Toshiba Laptop Won't Shut Down or Enter Sleep Mode

I have a Toshiba Satellite Pro R50-B-12Q.

Recently my laptop won't shut down or enter sleep mode. The screen goes black but doesn't turn off. I have to hold down the power button, which makes me nervous because I shouldn't have to do that. The laptop is around 3 years old and uses Windows 10. I got the update when it first came out, so it can't be because of that. It started before the recent update, so it can't be that either. I have updated all my drivers and checked the power options, which is fine. When I ran Task Manager to see what might still be running that could be preventing it from shutting down, there is nothing showing.

I Googled for help and found that people had the same issue but only after they updated to Windows 10, but I did that over a year ago without issue. I tried suggestions I found, but none have worked.

Anybody else have any ideas?

Thank you.
 
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