I'll never understand why people expect a tuner card to work differently than a TV in this context...
When you use a cable or satellite box like this _IT_ becomes the "effective tuner". If you've got a TV hooked to it VIA co-ax you set the TV to the appropriate "rebroadcast" channel and leave it there. Then you use the remote for the cable box to change the channel on the cable box right?
If you want to have some other device (like a Tivo or a KnoppMyth box) record off of the co-ax output of that cable box, you need to "pretune" them to the appropriate channel, and give them some means of controlling the box.
This can be done with various types of physical connections like serial cable, firewire, ... but the most common method involves something called an IRblaster, which is an output adapter which lets your PVR generate the same InfraRed signals as the cable box remote control does when you press the buttons.
Once you have one of these you need to set up a "external tuning script" which sends the appropriate signals to the cable box.
Searching for the term "irblaster" will find you the needed information on this.
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I’m a noob to this so everyone bear with me I have an AMD Athlon xp 1900+, 512mb, 180 GB HDD, onboard nivida video & sound blaster card. The box is set up perfectly from what I can tell connection to the internet works great and I get the listing for TV show just fine but when I go to watch live TV the machine restarts and when I try to record live TV all I get is snow.