The hard drive may have died (failed), in which case it will have to be replaced.
To check for drive failure, test it with Hitach Drive Fitness Test for DOS
which loads from a bootable CD.
Download the CD Image
from this pagehttp://www.hgst.com/support/index-files/simpletech-legacy-downloads#DFT
You can create a CD from the CD Image File with IMGBurn
from here: http://www.filehippo.com/download_imgburn/
then boot your Toshiba laptop from that CD and the drive testing utility will open.