It may be that the entire page has not loaded. If you try and print from a home page like Yahoo. It print just whats on screen or a bit more. Once you start scrolling more data is loaded to the page and then print option will now print the additional content. Keep scrolling and more content is loaded.
What are you trying to print? If you click file then print preview you can see what will print and the number of pages. If you chose the print option, make sure you print range is set to all pages.