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By default, Windows puts your laptop to sleep once you close the lid. So since the computer isn't technically on, you won't see anything but black on your connected monitor.

Michael Hession/NYT Wirecutter. Lenovo IdeaPad Flex 5i Chromebook Plus Laptop — Top Pick Best Buy deal price: $350; street price: $500. What we like: Our top pick for the best Chromebook. Offers ...

Though DuoScreen's concept renders all show it paired with a MacBook Pro, DuoScreen co-founder Nicholas Greco told me over email that it was built to support any 15-inch laptop. He also sent over ...

Generation and cable choice are also important to consider.For example, an HDMI 1.4 connector is perfectly capable of running a 1080p external monitor but isn’t enough to deliver 4K at 120Hz.

Is a laptop three times as good if it’s got three times the screens? That’s what Razer may be hoping with Project Valerie, a prototype multi-monitor gaming laptop that it’s announcing at CES.