It is a setting in the program that you are printing from. ( which you dont say what is )
But it will be under file / page setup
and / or
file / print setup
there will be a setting for "print double sided"
I have it set for double-sided printing. I am using Microsoft Publisher. I have used the same template for 7 years. This is the first time it has not printed on both sides when set for print double sided.
hit file / print
check the options under the printer and make sure that it is set for duplex there as well.
so if you print in non duplex mode it doesnt print the second page at all ?
make sure that it is set to print all pages and there are no control codes in between the pages and that it is not set to manual feed.