Lenovo ideapad y450 display problem?

My friend's laptop is an ideapad y450 and she's having a problem with turning the display back on after it turns off automatically (only the screen turns off; the computer/system itself stays on).

She said she was in her house using the laptop on battery, and then a warning came up saying that there's only 7 percent battery life left… So she went upstairs to get the charger but when she came back to the laptop, the screen was dead but the computer itself was still running. So she plugged the charger and tried to turn the screen back on but anything she tried didn't work (clicked the mouse, keyboard, even pressed the power button but still the laptop stayed in that condition). Then she thought that she should prolly just wait for it to charge a little but when she tried again later on, still nothing worked… So she had no choice but to force shut down/remove the battery…

So I was telling her it might be a problem with the screen…
.help please? Does anyone know how to fix this?

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