See if the backlight has failed. I use a flashlight to help determine this.
Next read http://reviews.cnet.com/5208-7587-0.html?forumID=69&threadID=167949&messageID=1858382 in which a lucky member fixed it.
I recently used the Restore Disk for my new Toshiba laptop in order to restore it to the factory settings. After completing the restore process my notebook went to reboot and as it began to reboot it just gave a black screen. Now everytime I turn it on the screen just stays black and nothing ever comes up even though I can hear it working. Nothing ever appears on the screen not even the BIOS or Toshiba logo. How can I fix this problems?