Hey nearly finished the latest blockbuster so back to my HTPC. I had the pinnacle PCTV rave ( quite good but had some noise : also had a herring bone pattern which seems to oscillate from about 315 to 045 directionwise) Bought the falcon for mucho wonga hoping it would improve things : not much improvement to be honest slightly less noise but herringbone still there. Bought an enermax power supply ... quieter than the quietPC one and better cooling ( machine was stable before but now its rock solid). No visible improvement to picture however. Reinserted all PCI cards and plugs : internal cables are all well away from capture card. The normal signal path is from a nokia digibox to an RGB to s-video convertor through a 15ft s-video cable ( decent quality shielded). Alternative input from a dvd player using straight s-video and a different shorter cable (again good quality but different cable : Ixos) also shows herringbone pattern. Both signal paths into normal 32" widescreen show as clean. Using the HTPC in a different room with a CRTmonitor shows the herringbone. Removed modem from HTPC ( I use it for surfing as my other PC is in bits for the time being) No change to herringbone. Removed internal case speaker : no change to herringbone. Changing Dscaler hardware settings from PCTV rave to normal BT878 (or thereabouts) and back makes no difference to the herringbone. Capture card is in slot furthest away from AGP port : Has 3 slots between it and the soundcard. Will try to better shield capture card using earthed aluminium/paper envelope trick. In the meantime anyone know what the herringbone interference would be indicative of ?