Laptop screen goes black

[Kxvadx]

I have an Acer Aspire laptop and my problem is that the screen goes black but when the laptop is still running. At first it seemed to only happen when I moved or lifted my laptop too much or too suddenly but now it's become unavoidable. I've cleaned the insides and the fan but that didn't help.
Does anyone know what the problem might be?

 

[ffg7]

connect to an external monitor to see if does same or not which I don't think it will as think you have a bad video cable between motherboard & screen.

 

[Kxvadx]

I don't have any other monitored but I've tried connecting it to my tv with a hdmi cable and that doesn't work

 

[Kxvadx]

Also, half or more of the keyboards on my laptop aren't working and my speakers have just stopped working. Are they all related?