If you are having trouble with your laptop, then take a look at this troubleshooting page.
Background and Identification
The Toshiba Satellite C55-C5240 was originally released in 2015 . This black laptop has the dimensions 14.96 x 10.2” x 0.93” and it weighs 4.85 Ibs. It also has an Intel i5 processor, 8GB of memory, and 1TB of storage. When it was first released, this laptop was targeted to students because of its 7 hour battery life.
The model number of this laptop can be found at bottom of the laptop on a sticker above the battery. It is on the top left corner of that sticker and should have the brand and model with the number (e.g Toshiba Satellite xxx-xxxxx).