biggy

Hi ugys,i just bought a 30inch widescreen advent hdtv ht3061a tv,i have the hdtv with a dishnetwork 6000 receiver,the tv works good in standard mode,when i switch it to hd mode,the hd channels look good,but the regular channels look weird,like when a person moves or runs u can see like a shadow of colors move also after the person,when i switch back to standard tv mode all channels look good,i am using the component cables for the hd,dont know if it is something wrong with the tv or what,if anybody could help i would appreciate it....i bought this tv at kmart on clearance for $330.......(maybe thats why...lol)) thanks