ps2pdf problem

[John Levine]

>However, when I pass the .ps file through the ghostcript with ps2pdf 
>slides gets trimmed.
>
>Is there some more advanced option for ps2pdfwr which will enable
>me to conserve the proper width  of  slides?

It sounds like your pages are formatted as landscape and are being
translated as portrait.  See http://ghostscript.com/doc/current/Ps2pdf.htm

There are also options for larger page size which might be what you want.