That depends upon what you are using with it. Monitors do not have integrated tuners and thus cannot select channels. However, most cable providers use set-top boxes that perform the channel selection function for you. Many of these boxes have HDMI outputs that can be used with monitors that have these input capabilities. Otherwise, you need separate audio and video connectivity from the cable box to the set, either in the form of composite video plus audio cables, or a DVI cable with audio cables. Again, this is dependent upon what the cable box and monitor support.
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That depends upon what you are using with it. Monitors do not have integrated tuners and thus cannot select channels. However, most cable providers use set-top boxes that perform the channel selection function for you. Many of these boxes have HDMI outputs that can be used with monitors that have these input capabilities. Otherwise, you need separate audio and video connectivity from the cable box to the set, either in the form of composite video plus audio cables, or a DVI cable with audio cables. Again, this is dependent upon what the cable box and monitor support.