This is a problem I have come across a few times.  What usually happens is that a user will try to print multiple copies of something but always just receives one.  This problem is caused by Mopier Mode being enabled by default.  Mopier Mode is supposed to minimize traffic by sending 1 copy to the printer. The printer is supposed to store the one copy and use it to produce multiple copies.  Most HP Laserjets do not have enough internal memory to do this, so only 1 copy is printed.

To disable Mopier Mode:
1.  Go to Devices and Printers
2.  Right click on your HP Laserjet printer
3.  Select Printer Properties
4.  Click on the Device Settings tab
5.  Scroll down to the bottom.  You may have to expand the Installable Options
6.  Click on Mopier Mode
7.  Select Disable in the selection box that appears
8.  Click Apply