There are three sets of outputs on the PVR: HDMI, S-video and component video. Most TVs have more than one HDMI input. If you have connected your PVR to your TV by HDMI cable, try selecting each HDMI input in sequence (through the TV) to see if it connects. If you have used S-video or composite video, make sure your TV is set to use that input.
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There is a manual here.