Could be the hard drive but try this first:
- Shut down, unplug the AC adapter/power supply/charger and remove battery.
- Press and hold power button for 20 seconds.
- Connect charger and press power button. What happens?
- You could also try taking out and reseating the RAM.
- Are you able to get into the BIOS?
Here’s a video on disassembling:
Here’s a link to the service manual:
Here’s a link to the user manual:
Note: Toshiba is now owned by Dynabook.
Hope this helps. Let us know how it goes.