Marc, I googled, Toshiba laptop freezes on start-up, may because of an incorrectly functioning master boot record or boot configuration. Check the attached links,instruction and guides, Good luck
I hope this helped you out, if so let me know by pressing the helpful button.
https://www.techwalla.com/articles/how-to-fix-a-toshiba-laptop-that-freezes-on-startup
http://forums.toshiba.com/t5/General-Troubleshooting/Toshiba-Laptop-won-t-load-Windows-7/td-p/266195