Hi John, welcome to Seven Forums.
Im pretty sure you have the same laptop as my girlfriend, if I remember rightly the repair options are under F8 when you switch the laptop on.
Boot the laptop, and spam F8 until the Repair options surface. (see attached screenshot, although it won't look identical, as it will also have an option that says "Toshiba HDD recovery" or something similar. LEAVE THAT OPTION ALONE!)
Run Startup Repair - Tutorial: Startup Repair
you may need to repeat this up to 3 times, until the laptop boots.