Hp LaserJet 1320 will not print multiple copies

This problem is caused by Mopier Mode being enabled by default. The idea of Mopier Mode is to minimise computer and network traffic by sending only 1 copy to a printer equiped with suitable internal memory. That stored copy is then used to produce the multiple copies. Most HP Laserjets do not have suitable internal memory and so only the one copy sent by the computer gets printed. To disable Mopier Mode:
Click Start
Click Devices and Printers
Right click your Laserjet Printer
Select Printer Properties
Click the Device Settings Tab
Scroll down to the bottom
If necessary, expand Installable Options
Click on Mopier Mode
Select Disable in the selection box that appears
Click Apply
You will now get multiple copies.

What happens if the Mopier Mode is shaded out?

Do you have a PCL6 driver installed? We had the same problem with several networked HP printers - downgraded the driver to either PCL5 or PS depending on the printer and driver available and users are now able to print multiple copies.

Try another program, and select multiple copies. If the printer print multiple copies from the other program its the software. If it does the same thing it is the printer. You can also test with anoter computer.

I just upgraded from XP to Win7 and had this problem. Go here to find the latest driver:
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=US&swItem=ja-35999-18
This is for the 32bit version. To find the one for the 64bit version, go to the same link above and enter in the search box:
HP Universal Print Driver for Windows PCL5 x32
One of the files automatically runs, with the other, you have to find where it unziped the files and run install.
These files were just updated in Dec of 09.