Can't see any bonjour network printers

I have a MBP 17" running 10.6.8 and I've lost the functionality to see or add any network printers.
It was running 10.5 and I lost the ability to see or add new printers. I reset the printing system and then lost the ability to see any network printers at all. It still recognizes our HP printers when plugged in via USB, but not over the network. So I upgraded to 10.6.8 today to see if that would solve the issue. It didn't.
I go into system preferences and try to add a printer but it shows that there are no available printers. Even though on my MBP 15" I can see both of our HP printers over the network just fine.
I can add the printer via the IP address and choosing the correct driver but I'm still unable to print. I CAN print a test page from the HP Print Utility...so it can see and talk to the printer (HP Photosmart Premium c140), but I still can't see it under the Print and Fax preference pane.
I'm at a loss here.
Does anyone know why I would loose the ability to see any Bonjour devices over the network? Any thoughts on solutions?

I have an HP c309a All-In-One printer and am having a similar problem. After upgrading to 10.6.8, I can no longer scan wirelessly but I can still print. Bonjour seems to have disappeared and is no longer a means to connect to my printer. It will only connect via Bluetooth. My mother has the same printer and OS and she too said she's having problems scanning.
I've tried to scan using HP scan software, Preview and Image Capture to no avail. Of course, the Apple Tech said I should talk to HP which I did. The HP guy said, I should be able to use Bonjour and that there is probably a conflict between Bonjour and Bluetooth. If he gave me anymore advice, it would cost me $20 because the 2 year old printer is out of warranty. Ridiculous.

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