my 2 cents :
if your samsung PTV is 42", make sure ur vaio is not attempting to output the max 1360x768 resolution. only the 50" model supports that.
in any case, connect the samsung plasma as 2nd display, but set it to a low resolution, 800x600 works on just about any tv.
if it still doesn't work, its a problem with the tv / its PC input port.
if lower resolutions work fine, then the display timing settings are screwed up for 1360x768. use powerstrip
http://www.entechtaiwan.com/util/ps.shtm
to change them. you need to match more than just the vertical refresh rate of 60 Hz -- also the horizontal frequency of 47.7, and the two polarities of +/+ (according to the manual at
http://www.samsung.com/hk/support/pr...smadisplay.sec)