I'm a newbie here so please bear with me.
I have an Acer Extensa 5620G with a black screen.
It displays perfectly to an external monitor.
I have changed the screen for a new one but the same result
I have changed the Screen Cable for a new one and the inverter but with the same result, I don't think it is the graphics chip as it displays to an external monitor.
I am baffled and would welcome any suggestions.
Thanks in advance.
In all likelyhood the screen is working fine, but the back-light is not getting power. As WR2 suggested, try putting a flashlight to the screen and see if there is an image there, but the backlight is simply not working. if you have a volt meter then try the power for the CFLs and see if there is any juice there, and what voltage it is at.