Try printing in more than one application. If you can't print in Microsoft Word, but you can print in SimpleText, the problem may not be your printer. Check for paper jams. Turn the printer off, open it up, and look at the inside to see if scraps of paper are visible in the spool or gears. Print a test page.
Most printers have a test page button or procedure for printing a test page.
Check your documentation for more information on printing a test page.