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Hello and thank you for your question, I look forward to assisting you today. What model of Acer, and was the screen damaged?
The Acer should have a standard VGA port you can connect an external monitor to. It should detect it as soon as you plug it in, but you might want to have both powered off first. Power on the monitor, then the laptop.
They will usually have a standard VGA port unless it has a DVI port instead?