Pc doesn't startup propperly

Registration date
Wednesday October 19, 2016
Last seen
October 19, 2016
i have my pc for a year now and i have a problem when i start my pc, it loads but after a while my screen turns black (it still loads) it turns to normal for a few seconds and when I try to login the screen turns gray and if I ender my password and login the screen turns black then gray and than it kicks me out and I have to login again.

I now dont shut my pc down or restart because of that and i only turn it to sleep mode (it works propperly when i wake it up)
the only other way for me to start my pc is to restart it a few times untill the troubleshoot starts then continue to windows 10.
after that my pc starts normally but thats my only way
does anyone know how to fix this?

amd FX-6300
ARSRock980DE/U3S3 R2.0
Sharkoon WPM500 Bronze
seagate Desktop HDD ST1000DM003 1tb
kingston hyperx fury black hx318c10fbk2/8
msi gtx 950 2G