I've had the exact same problem and have uninstalled and then installed new printer drivers from hp. No luck. I've done this several times and the only way the printer works is with the USB connected.
Well the resolution to this problem is pretty simple.You need to uninstall the printer from your device manager.restart your computer and plug and play.This should resolve it.If you want any further support, an online technician from techbuddies can help you for free.For this log on to http://tinyurl.com/m7ghqz
This is a free Mac OS X driver installer package for the HP Officejet 4500 wireless all-in-one printer.
Enjoy the convenience of wireless connectivity with the Officejet 4500 wireless all-in-one printer. You'll be able to print, copy, scan, and fax all from one device, plus print at speeds as fast as 28 pages per minute in black and 22 in color. And with tje Officejet inks, you'll get professional-quality color printing at a low cost per page.
http://mac.softpedia.com/get/Drivers/HP-Officejet-4500-Driver.shtml
Click on this link or copy and paste the complete link into your browser.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe
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