I'm betting you have the wrong "biscuit" style connector for your card.
If your card has RF (coax) connectors (male for NTSC, female for PAL I think) then you don't want the connector that has 2 more of them on it. You want the one with the VGA connector and the 2 mini-DIN.
AIW X800XL
AIW-X800XL.jpg
AIW X800XT
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More information:
http://www.digitalfaq.com/forum/vide...html#post64314
Here's a discussion of the opposite problem:
http://www.digitalfaq.com/forum/vide...html#post60378
Note also the additional Catalyst/MMC software available in that thread which seems to work for the X600. I will be trying this with my X1800XL but your X800XL might be more amenable.
Ebay options for the cable (I believe you need) here:
https://www.ebay.com/itm/ATI-DELL-HD....c100005.m1851
or
https://www.ebay.com/itm/ATI-Dell-HD...75.c100623.m-1
There may other sources, possibly for just the cable you need.
MW