I have a Toshiba satellite l655d-s5050 laptop and I need to know how to restore it to factory defaults.

On recent Toshiba models holding down the "0" key while powering on should initiate the out of box reimage process from the hidden recovery partition.

Have you tried this?
https://www.csd.toshiba.com/cgi-bin/tais/support/jsp/bulletinDetail.jsp?soid=2737864&pf=true