What kind of tuner?
My comcast box has DVI out up to 1080i, but HDCP is required.
The dell 24" LCD has it, but maxes out at 720p using HDCP
with current versions. Such a shame considering the native is 1920x1200, otherwise it would be an ideal hybrid monitor for work and play.
Otherwise you usually need a HDTV LCD or a
"HD-Ready Monitor" LCD (or whatever way they call it now) which is one without a tuner but has HDCP.