or is it connected to a USB hub?
Have you tried it in a different USB port?
Have you tried the wireless printing option? If so, does it do the same thing?
I have iMac OS X, 10.6.7, 3.06 Ghz, 4 GB. HP Officejet 6500 E710n-z printer. I am new to the Mac. Problem - the only way I can print is to disconnect the printer entirely and plug back in. The printer shows up in the hardware list via a USB port and is the only printer connected - designated default printer. I am not using the fax capability. When I look at the status of the printer waiting for it to print - the message says "waiting for the printer to become available". The current status right now shows idle. I have spent hours with HP help desk trying to solve. Office Depot switched out printer for me thinking it was a (?) loop problem with the 1st machine. This may make me sound very computer savvy - please believe me, I am not! I can continue to plug and unplug, but it sure would be nice to click print and have it happen! Thanks.