Screen won't start

Nothing is working. The computer is starting up but there is no screen.no keyboread.no mouse. I can't control anything
I tried alot of things but it won't work
Help plzzz!!!!!!!!!

Hi, sorry to hear of your difficulties. For anyone to help, could you please tell us:
1. Has your PC ever worked with Windows 10?
2. If it has, what happened before it stopped working?
3. Or have you only just installed Windows 10?
4. How have you installed Windows 10 - did you upgrade or do a clean install?
6. Exactly what happens when you boot up?
7. Do you have Windows 10 installation media?

Anything else that tells the history briefly.

Finally, please complete your system specs. (There is a tutorial on this if unsure).
Thanks.

It did work fine with windows 10.
I right clicked on the c drive and went to properties/security/ and I unchecked all of the allow checkmarks.
So what happened is I think I locked my c drive so it sayed (NTFS) under the c drive.
I restarted my PC and nothing was working

Do you have any disk images?

Very strongly recommended to avoid catastrophe and provide a way to get your PC back up and running exactly as it was when you created the image, assuming no hardware fault. Macrium reflect free, or Aomei Backupper free, + their boot disk + external storage medium.

How much would you lose if you did a clean install?

4. How have you installed Windows 10 - did you upgrade or do a clean install?
7. Do you have Windows 10 installation media?

Finally, please complete your system specs. (There is a tutorial on this if unsure).

I don't have a dics image
I upgraded my windows
A clean install

How can I do that if I have a black screen .

Flash your BIOS.

Hi ignore the last two suggestions please...!!

Here's your solution (I hope- I've never been in that position).

1. Download a boot disk such as Hiren's or Falcon's.
(A search engine is your best friend here)
This runs a mini version of XP and will allow you to view your disk drives with explorer.
2. Research using a boot disk with your PC. (Mine is BIOS- that's easy, but there are things you have to do to use a boot disk if your PC uses UEFI - I'll leave you to research that).
3. Insert this boot disk and boot your PC from it.
4. Open explorer- locate your Windows disk or partition, checking carefully it's the one that contains Windows. (Drive letters may be different).
5. Reverse the changes you have made to the Security settings of that disk or partition.

Note: I make no guarantee of success- I've never tried this.

Aside: I'm sure there would also be a way of booting from a Win 10 installation medium if you had one, navigate to a Command Prompt, and do this by command line instructions. However I would have no confidence in doing this for what you need.

What should I do then??