IMac Printing Doubles

[IndigoRose]

I've had my awesome 27-inch iMac for a year next month, but in the past month or two it's been printing two copies of everything. Now please don't tell me "you probably clicked the print two button" because that's not it! It only does it to our HP3600 laser jet color printer, not with our HP2100 black and white. It's wasting paper and ink, especially when I print a big document! It's also making my parents upset so please help!

 

[triforceguy1]

Have you tried checking all the preferences with that printer and the drivers for the printer?