Black Screen After Login With Movable Cursor. Eventually Works Correct?

My computer loads normally to the login screen. I enter my password and press enter.It displays the welcome message with the spinning circle thing, and seems to load correctly. When finished, it is at this point my screen goes black showing only the cursor which I can move. When I hover over where the taskbar should be, the screen dims a bit. When I move away from the 'invisible' taskbar, the screen brightens to it's original state. This leads me to believe that the desktop may be loaded, but for some reason is not displaying. After about a minute, everything displays and the computer works perfectly. Occasionally, there is not an issue, and the desktop loads perfectly, seconds after logging in.