Macbook, no screen activity.

I just got back and switched my Macbook on, and there is no screen activity. The laptop was working fine last night, but now nothing.
When i put the charger in. It goes like it usually does, green for a few seconds and then orange to show that it is charging. It wasn't low on charge last night though, when i close the lid. The white light coming on, but doesn't flash. Just stays white.
Does anyone know how to sort this, because as i said. It was fine last night, and also should i charge it for an hour or two then try it again? Although, i think the laptop is on but no screen activity. Even when I hold the power button, still nothing happens and it doesn't switch off.

I really need to know if anyone has any solutions...?

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