First I would go to the lexmark wesite at http://support.lexmark.com/index?locale=en&page=product&productCode=LEXMARK_X5150&segment=SUPPORT&userlocale=EN_US#1
and download and install the latest driver. It may require uninstalling the current driver. The newest driver will have any updates and corrections and may solve your problem. Even if this is not the problem it can't hurt to have the most current driver.
If this doesn't solve your problem, when you are ready to print do a "print preview" which will show the layout and how many pages you are going to print. If it shows two pages (one being blank) see if there are extra spaces at the end of your text which is causing it to spill onto another page. You can also reformat the page with narrower headers and less margin which should allow your text to fit on one page. This can be done by selecting "page setup" under the "File" header. The default for most printing has very large margins/headers and they can be reduced.
The last change you could make would be to choose a smaller text to fit all the information onto one page. Additionally if none of the previous solutions work when you print, a window will open, called "page range", which allows you to select the pages you want to print . You could either choose "current page" or click on the bullet for l"pages" and type "1" in the box. This will limit the computer to printing only the first page.
Thanks for using FixYa and for the Great rating.