I am having almost identical issues. The fan was running a lot and then I started getting a black screen because my monitor would turn off. I set sleep settings to “never” and was able to bring up the computer, but the video would last for only a few seconds and the monitor would click off.
If I could start an operation (like launching an application) with the computer while the monitor was on, it would sometimes stay on. Once I got it to stay on, I’ve kept it on and signed off the internet when the computer was not in use.
I’ll be taking the computer back to the techs on Monday to see what they can do. It is bizarre. I do need to see if remote access is on or off, that is scary! I did get a pop-up that said my hard drive would be destroyed and that I should call a number on the screen to restore it. I immediately shut the machine down and used task manager to stop the activity.
Are you running Norton’s products by any chance? Norton internet security specifically? If so, this_ol_patriot has the solution and gave al ink to the file you need from nortons to fix the problem
[[I did get a pop-up that said my hard drive would be destroyed and that I should call a number on the screen to restore it. ]]
Hiowever, what you have I believe is what they call ‘Ransomewear’ a particularly nasty virus- do NOT send them any money- if you have another computer, which I assume you have to write this? access the internet and see how to get rid of ransomewear- I’m afraid it looks like you’ve been infected-
have you tried doing a system restore? Go back quite a ways if you can- You’ll have to get to ‘advanced boot menu’ options by hitting the F8 key repeatedly when you restart your computer- keep hitting it until the menu comes up- And choose “Repair Your Computer” from there- you’ll find the ‘system restore’ feature In there-
Here’s a link showign thje process- print off the isntructions, or have the page up when you do it
http://www.pcworld.com/article/2084002/how-to-rescue-your-pc-from-ransomware.html
go down to the ‘Remove Ransom ware” section, and the section below it IF the ransomware has encrypted your files- but you probably will just need to do the remove ransomware stuff-
Goodl uck