A:AnswerThe cable you might be using only supports up to 120hz, Mine came in already overclocked at 165hz and with VSYNC or capped rate it holds a consistent 165hz
A:AnswerThis is not something Acer can assist with but you might post your question on the Acer Community where there are many users that offer advice and assistance on Acer products.
A:AnswerI have 2 connected to my laptop. You'll just need an hdmi splitter or a docking station if your computer/output source doesn’t have 2 hdmi or display ports (or 1 of each).
A:AnswerI believe once the power comes back on, the monitor will default to turning on, looking for a signal and if it doesn't find a signal, its going to power itself off.