OfficeJet J6450 - Printer connects wirelessly but doesn't print post cable modem replacment

Equipment: My printer is an OfficeJet J6450. I run Windows Vista, current update.
Likely triggering event: I replaced my docsis 3.0 modem with a doscis 2.0 modem. The ISP remained the same. All other computer software and firewall remained the same.
Malfunction: After the cable modem replacement, I found that I could no longer print to my HP OfficeJet 6450. I would get an error in the printer window "Error - printing." After restarting after the initial error appeared, I would get the error "Error - sent to printer."
What I did:
At first I uninstalled and re-installed the HP software for the printer (complete package with exceptions of PhotoSmart and HP customer monitoring program).
Using the printer's network connection wizard, I entered the wireless router password to the printer. At first I didn't get a connection. Then I restarted both the computer and the printer. I also returned to the network default setting on the printer, and repeated the configuring the network. The connection finally succeeded.
The network self-test page and the printer's network wizard confirm the connection. The printer's digital display and the HP diagnostic utility also confirmed the connection. But the diagnostic utility can't print a test page and throws up an error - "Test print failed."
The disappointing result: I still cannot get anything to print wirelessly.
...Thanks in advance for your suggestions to get my printer back up and running...
This question was solved.
View Solution.

Go to Start > Control Panel > Printers and delete all instances of the printer.
Next, re-add the printer:
1. Make sure the printer is turned on and connected to your network. Verify that you can access the printer's internal web page by browsing to its IP address before continuing. Get the IP address from a Wireless Netowork Test on the front of the printer (usually in the Network menu).
2. Click >> Start >> Control panel >> Printers.
3. Click the Add a printer
4. Select Local printer
5. Select Create a new port and select Standard TCP/IP Port and click Next button.
6. Under Device type, select TCP/IP Device. Under Hostname or IP address, enter the printer's IP address. Click Next.
7. Select Hewlett-Packard from the list of manufacturers and select and select your printer model. Click Next.
If your printer model was not listed, then select Have Disk, browse the HP CD that came with your printer and select the first file that starts with hp and ends with inf. Click Open then OK. Select your printer model. Click Next.
8. If you are asked, use the currently installed driver.
9. It will ask for the Printer name -- enter a new name or use the existing one. This will be the name of the printer that you select from other applications.
10. You may be asked to share the printer. Choose NO.
11. The Print Test Page box appears. Go ahead and print it.
12. Click Finish.
Say thanks by clicking "Kudos" "thumbs up" in the post that helped you.
I am employed by HP

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OfficeJet J6450 - Printer connects wirelessly but doesn't print post cable modem replacment

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