My pc starts up boots fine then the monitor goes black. Tried everything I can

[Radkres]

I Do not know if this will help I copied the website info down below.

If you can get to the Login screen
Check connections to external devices
If you have several external devices plugged in, remove all and try plugging them in one at a time. This way you can identify which device is problematic.
Sometimes, additional hard disks can also cause this problem. It is better if you can detach additional hard disks when you're doing this.

Safe mode
When you come to the login screen, Select the Power button while holding the Shift key. Then Click Restart.
When your PC is restarted, you'll be prompted to the recovery screen. On that screen, select Troubleshoot → Advanced Options → Startup settings → Restart
When your PC restarts, you'll see a number of options. Press F5 to select Safe Mode with networking.
Once your PC is started in Safe Mode, you can try either of the following options.
Uninstall the display driver
Open the Device Manager and locate your Display Device
Right click on it and click Uninstall.
Turn off Fast Boot.
Control Panel → Power Options
Click Choose what the power buttons do
Click Change settings that are currently unavailable
Under Shutdown settings, disable Fast Startup
Microsoft also suggests disabling RunOnce processes and services, in order to fix this black screen issue.
Get the Task Manager
Check Processes and Services tabs for any instances of RunOnce.exe or RunOnce32.exe.
If there are any, click End Process in the Processes tab and Disable them in the Services tab.
Then restart your PC.
If your login screen never appears
Check connections to the external display
Try connecting your display to different available output ports. Sometimes, changes in the drivers can cause the output to be transmitted to a different display port.


Try changing the projection mode by pressing Win Key + P and trying out different combinations.
Press Win Key + P → Press P again and hit Enter.
Repeat the above step

Safe mode
Since you can't have the login screen, you can't get into the Safe Mode directly. So you're going to need either a Recovery Disk/USB or an Installation Disk/USB.
Boot your PC with the bootable disk/USB you got in the above step.
On the Windows Setup screen, select Repair your computer option. If you're not seeing this screen, your PC didn't boot up from the bootable media you inserted, and check your PC manufacturer's website for more info on how to boot from a secondary media.
On the next screen, select Troubleshoot. Then you can select the Safe Mode. Select Advanced Options > Startup Settings > Restart.
Now you can continue the same steps from iii) in the Safe mode section of "If you can get to the Login screen"
Disconnect the installation media and restart the PC after all the steps.

[AngellsGraphics]

If my display driver is corrupted I don't know how I can fix it if I can't see the screen.

[AngellsGraphics]

That site wont' work says it is corrupted .  It boots fine. Graphic card drivers are ok as far as I know. I wondered if the monitor changed back to the old one, and not the tv for some reason as I use this for my grandkids it worked fine until one day I got the black screen problem.  I tried settings in the bios after it booted but it won't let the monitor stay on long enough to see what I am doing. IF I click on the monitor power button it will light up so I can see windows loaded, but it shuts down again then I turn it off and back on and I can see the screen again for a  minute so weird

[Radkres]

Two Things it might be
Your Fast Boot image is corrupted.
Your display driver is corrupted.
https://www.reginout.com/help-center/windows-10-booting-black-screen-tackle/

[AngellsGraphics]

I took out the memory test it is fine, I replaced the cpu and fan, still the same , changed power pack still the same. Once it starts up I know windows loaded because when I click on the monitor which is a flat screen tv I power it off and on I can see the window for a second, but it goes off again. I can't figure this one out. I wonder if I need a new motherboard, no capacitors look bad.