Couple of questions: Are you using UEFI? And, if so are you trying to use the same EFI partition for both Windows & Fedora?
If so it is a known issue and there is a workaround.
EDIT: This thread has the work around if this is your problem.
If this isn’t your issue you can access the terminal with Ctrl + Alt + F2 and use fpaste to upload the logs to be able to share them here.