Toshiba NB255-N245, I get a blank screen

Try this followind method to get rid of Black Screen Problems.

1 . Take out your Laptop Battery
2. Remove your AC Adaptor Cord, that's the wall power, remove it.
3. Now hold down the Power Button for 30 Seconds
4. Then Plug your Battery and Plug it on the wall power
5. Then Power ON your laptop

if problems persist dont forget to leave some comment to solve your problems.
And I'll post some another tips

Basic Steps to Troubleshoot Desktop Computer

• Restart the computer.
• Check your cables. Keyboard not working? Make sure it's plugged in. Mouse not responding? Make sure it's plugged in.
• Check the electric power. Plug a lamp into the same power outlet that's connected to your computer to make sure the outlet is working.
• Make sure the computer and monitor are plugged in.
• Disconnect all peripheral devices (such as a printer or external Zip disk) and restart the computer.
• Listen for unusual sounds. Is the cooling fan running? Is the hard drive making noises?
• Look inside the computer for wires that aren't plugged in all the way or other faulty connections.
• Start the computer from an external start-up disk, such as your bootdisk or cd recovery