Problem how to turn on laptop in Turned off display Window

i had a problem reguarding on turned off display windows. i make a mistake in putting how many mins will it take to turn off while in standby. i accidentally put 1000 but didnt noticed it was minuites. i need help to fix my laptop and turn it on again. i tried + p arrow down button and enter but it didnt wokred. is there any other ways to fix it? thanks to all good people who can help reguarding on my problem.