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If you have access to a desk top computer monitor, plug it into the side port on the laptop. (usually a blue port) and see if you have a video signal. If the Desk Top Monitor functions, and the Laptop is black; your Laptop screen is NG.
A way to test your Video section is to attach an independent desk top monitor into the port on the side of the laptop computer. If you cannot get a desktop picture on the monitor, then your Video portion has been compromised and needs repair by a technician.
Sounds like the acer is in dual view which means it has extended the desktop across both screens...if you move the cursor to the right, it would probably appear on the external monitor. Try holding down the "Fn" key and tap the F5 key. This should toggle the Acer One through it's video settings. Tap slowly, giving the netbook time to switch video outputs, you should see eventually the desktop with icons appear on the external monitor. You may have to change the resolution, but it should work regardless.
Toshiba has a problem with the connector from the LCD to the board which breaks over time. You will need to replace it. Here is a sample of what the part looks like. You will need to specify your model.
This one is from a DELL, the one below is from a Toshiba. This went bad even though the client never used the notebook as a portable. It sat on a desk for years and was never moved.