refresh rate on hdtv with hdmi video card

i have LG led lcd.
when i connect hdmi video card from PC win7, screen sometimes flicks.
especially raw tv ts data gets flicks or gets some noise.
when i play on wd tv live player on same tv, it's ok.
is this the problem refresh rate on tv?
which one should i choose? interlace  28 or 29?
Hiroyuki TamuraField EngineerAsked:
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CallandorConnect With a Mentor Commented:
HDMI should not require you to set anything in the refresh rate, that is for VGA settings (analog).  Check if the cable is not making good contact, or try a different cable.  If you have a different HDMI source, such as a bluray player, try that on the same HDMI port on the TV - the port may be bad, and if you see the same problem, this would expose it.
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