IMac won't connect to network laser printer

Hi,
I've recently purchased a new 27" iMac 3.4 GHz with 16 GB RAM running OS 10.6.8. Everything has been running smoothly until this morning when I accidently switched off my HP LaserJet 4000n. After I turned it back on, I found that I could no longer print from the iMac to the Lasterjet any more. So, (stupidly) I thought I'd remove to printer from the Fax / Printer selection in System preferences and simply click + to add new printer and reinstrall the HP LaserJet 4000n. But here's the problem, my new iMac won't let me add a new printer because it can't find the HP LaserJet. I have tried everything. I even got a message saying the Appletalk was not turned on - interesting as 10.6.8 doesn't have appletalk any more. I did however find that Appletalk had been switched off on the G5, so I clicked it back on, but i still couldn't locate the HP LaserJet on the iMac. I can get the iMac to print if I connect to the HP LaserJet 4000n as a shaed prionter by turning on the G5 and using the Bonjour shared prointer facility, but I got the imac so I could sell the G5. I don't want to have to keep turning on another computer just to print off a recipe for chicken soup.
I spent about 6 hours on the phone to Apple support today with an elevated support person, but even they gave up in the end after we had tried everything. I even tried to copy the system file to another HD to see if I booted up just form the system if it would connect to the printer in the absence of all applications, but couldn't as i kept getting an error type 8003 message about 45 seconds into the copy process. As you may imagine I am seriously frustrated and not a little pee'd off.
Any clues as to what's happening, and also, how come the Apple support guy didn't ask me if i had backed everything up on Time Machine - which I do. Odd.
It's probably too late fore that option now anyway as he got me to renew the DHCP leases - so my router will have different numbers now.

I'm using the same printer with my late 2010 iMac (3.2GHz i3, 27") running OS X 10.6.7.
Took me a long while to get it to work, because I'd had it set up to work with my G4 running OS 9 via AppleTalk, and the iMac needs to connect via IP.
The setup that finally worked for me -
In the Print/Fax control pane in System Preferences, click the add button. In the Add Printer window, click the IP item in the header bar. In the new screen -
Protocol - set to "HP JetDirect - Socket"
Address: enter the IP address of the printer. If you don't already have that, you need to get it from the printer itself. To do that, use the "Menu" and "Item" buttons on the printer to step through the various offerings until you get to the Configuration page - select to print that page. The printer's IP address will be included on that page.
The IP address was not included on that page when I first printed the page. I think this was because it had originally been set up to use AppleTalk. The solution was to do a Cold Reset of the printer. To do that, turn the printer off. Hold the Go button down and turn it back on. Release the Go button when you see resetting activity in the message screen on the printer. Once I did that, the next time I printed the Configuration page the IP address was included.
Leave the rest of the Add Printer screen blank.
That should take care of it.

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