MacPro Printer Cable to HP Lazer 4050N?

I just got rid of my PC after a major virus ate it up.

I have a Macbook Pro and want to use my HP Laser 4050N with it. Printer has 3 ports on the back, two of which look to be RS232/DB?. Socket has 5 sets of sockets in 3 rows (15 total). Can anyone tell me what USB cable (and where to get it) I need to make this printer work with my new Mac. Tried the MacStore and they said try here!

TX

HP LaserJet 4050 Printer series -  HP LaserJet 4050 Series Printers - Product Specifications - bpl06721 - HP Business Support Center doesn't show that the 4050N has a USB connector unless you have the Mac-USB version..

There should be a RJ45 connection it looks like, so you can connect it to a router and then use it as a network printer from your MBP..