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Yes, this TV can effectively function as a monitor from a PC or Mac, in both mirror and extended desktop mode. You just need an HDMI cable to do the hookup. There is no VGA connector so you'll have to use HDMI. If the laptop doesn't have an HDMI port, but does have a DisplayPort or Mini DisplayPort, you can use an appropriate adapter (e.g. DisplayPort-to-HDMI) and then connect the HDMI cable. I've also hooked up an iPad Pro (with USB-C-to-HDMI adapter) and played a 4K video off of it. Do bear in mind that if you choose "mirrored" desktop, the operating system (e.g. Windows, Mac OS) will favor the resolution of the less-capable device, which most likely would be the laptop's built-in display. This means the image on the TV screen may appear grainy because it's not being displayed at the optimum resolution (either 1080p or 2160p). For example, if the best resolution the laptop's built-in display can handle is 1360x768, in mirrored mode the TV will also run at 1360x768. This is not a shortcoming of the TV, but rather a limitation of "mirroring" itself -- the least-capable device will determine the resolution. This is a non-issue when in "extended desktop" mode because the TV can run at its native resolution.
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