Black screen and don't know how to get my screen back

[weekleydl]

Hi everyone, I have a Toshiba laptop running windows 10. I tried to update several times but it kept going to sleep and interrupted the download. I shut off all things that would allow it to sleep! Unfortunately, I may have turned the screen off. when it rebooted now I can't see anything on the screen! It's black! I don't have a backup so not sure how to get my screen to light up so that I can change the settings again! Can anyone please help?
Thanks,
Don

 

[webworkings]

Try this...

1. Turn the laptop off (not sleep or hibernate but off).
2. Connect an external monitor to the laptop.
3. Turn on the external monitor.
4. Turn on the laptop.

NOTE: You may have to press an "external monitor" button. Could be the f4 button or a button with two monitors on it, for the external monitor to work.

If you can see fine on the external monitor, then your attached display, or the ribbon cable that connects it, are your problem.

If you can't see on the external monitor at all, or the problem occurs on the external monitor as well, then it is probably the graphics card/GPU that is the problem, which may require the motherboard be replaced.