Bought a new 40" Samsung LCD HDTV from PC Richards. Salesman explained I needed 120 Hz for my new HDTV service and steered me towards this particular one. When I got home and was assembling the stand on it I noticed on the permanent tag on the back tat also posts the serial number this- "AC 110-120 V- 60 Hz- 180 W". There is no mention of Hz for this particular set on the box or in the manual. On the PC Richards site I can find this model exactly and it states it is 120 Hz. Why doesn't it state that instead of 60 Hz I wonder?