I used your automatic downloader, then I opened minecraft under the new profile. I selected MCA and 1.8 when doing that. When I opened minecraft it did what forge normally does, then the screen just goes all white. I've tried restarting it a few times but to no avail. Plz help

Btw I have an hp Pavilion with an amd A10 processor and windows 10

Can't reproduce any issues with this, I'm afraid. Reinstall Minecraft, Java, all that stuff, and try again.