How to reset cable box mine went blank
Just unplug, then plug it back in.
If your cable box went black, do you mean that the lights on the box's display went off? As gamerguy suggested, unplug the power cord and plug it back in and then use the remote to turn the box back on.
If it still won't turn on, plug something else into the outlet and see if that device turns on. That'll help determine if the issue is with the outlet or the box.
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