If it's an average inkjet printer and it hasn't been used for a long time, try running the deep cleaning routine a few times and see if that unclogs the print heads. As Norman says, see if the ink has dried up and replace the cartridges if necessary.

I recently bought an Epson printer that uses ink tanks instead of cartridges\. You fill the tanks up with ink from bottles, and it seems to last much longer than the cartridge type of printer and not so prone to drying out.