I installed Fedora Cinnamon, and after the installation was complete, I updated it as usual with sudo dnf update. After the update, when I restarted, I was able to log in and enter my password. After successfully logging in, the screen went black, with only the mouse visible. So I reinstalled it and asked the AI, and it said I must use RPM Fusion. I followed the instructions to install it, but it’s still the same. Please enlighten me, because I’m interested in Fedora. 
My laptop is an Acer Swift 3 Infinity 4, Intel i5, Intel Iris XE graphics. Thank you.
First rule on the road to enlightenment: put away the AI.
As a workaround for your problem while it is fixed,
go to a new tty with
ctrl+alt+f3
and log in there.
To start Cinnamon manually type
cinnamon-session
I have not confirmed this, as I don’t have Cinnamon, so if that cinnamon-session does not work then have a search and you will find the correct command eventually.
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thank you sir
Glad to help, did it work?
I’ve had this problem, fresh install of F23 on an Intel NUC, and the first few times I booted it, the GUI login worked, after that, blank screen and just a mouse pointer. I looked through $HOME/.xsession-errors (I logged in from my laptop to look), and didn’t see anything that meant much to me.
I tried @MatH’s idea and it worked! Got a working desktop. Thanks!
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AI is a great tool to troubleshoot things as long as you don’t blindly trust it. Lets not demonize it. It gets things wrong sometimes but that doesn’t mean it’s useless.