black screen before login, windows 10

Sep 16, 2017 4:45AM PDT

Hi everyone
my custom built pc stopped working yesterday. When I turn it on, windows loads normally and just before loging into my account, the screen turns black. Sometimes I can hear windows still working in the background (music) but I can't see anything.

Once or twice I managed to log in but the colors were wrong or there were weird dots on the screen and eventually the screen goes back to black. Once it turned all blue, that was a nice change after a whole day of banging my head against the walls

Most of the time I can start in safe mode (I get to the windows recovery mode with no problem), once I even managed to start in bootlog, saw that a good many drivers do not load (but I don't know what it means), I started running a scan for viruses and update windows but the screen went black again before I could find any cause for my problem.

From what I have managed to gather, windows is updated, my graphic card drivers too. I think the bios was updated to the last version too.

I have tried to uninstall the graphic card and the monitor (warning sign on it in device manager, even though I have tried 2 different screens and the problem is the same so I don't think they are the issue): it didnt solve anything.
I also tried startup repair and system restore to 2 previous points: no luck

I just don't know what to try anymore.
Any help or advice would be very welcome. Thanks

Here are my specs:
windows 10, 64bit
motherboard asus P7P55LX
processor Intel core i7 CPU 860
RAM 8gb
Graphic card AMD radeon hd 6870

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