You have updated the kernel. This always leaves the last kernel present in case there are problems with the new version. Fedora automatically allows 3 versions to be present. After that it deletes the oldest when it installs a new one.
I think your problem is graphics related. Do you have an nVidia graphics card ?
Have you ever installed the nvidia drivers ?
If so, I would interrupt the boot at the grub menu, and edit the kernel options for the latest kernel by adding rdblacklist=nouveau to the end of the line. Then hit return.
Further details on configuring an nvidia card so that you don't have to update the driver each time a new kernel is installed, can be found here
. I suggest using the RPM Fusion approach.