I was in a rush and I turned off my desktop computer by pressing and holding the power button until it turned off and when I came back and tried turning my computer back on. After the loading screen, i would normally see the screen where i type in my password to access my computer but this time it was stuck on a black screen and i couldnt do anything other than move my mouse. I searched around for a solution but none have worked so far. I tried pressing f8 during the boot screen to access the boot menu and i tried resetting my computer to a previous date before this whole situation happened but my computer did not save any previous date so i cannot roll back my computer.